Search (24 results, page 1 of 2)

  • × theme_ss:"Data Mining"
  1. Information visualization in data mining and knowledge discovery (2002) 0.06
    0.060518228 = product of:
      0.121036455 = sum of:
        0.10374144 = weight(_text_:fields in 1789) [ClassicSimilarity], result of:
          0.10374144 = score(doc=1789,freq=18.0), product of:
            0.31604284 = queryWeight, product of:
              4.951651 = idf(docFreq=849, maxDocs=44218)
              0.06382575 = queryNorm
            0.32825118 = fieldWeight in 1789, product of:
              4.2426405 = tf(freq=18.0), with freq of:
                18.0 = termFreq=18.0
              4.951651 = idf(docFreq=849, maxDocs=44218)
              0.015625 = fieldNorm(doc=1789)
        0.017295016 = weight(_text_:22 in 1789) [ClassicSimilarity], result of:
          0.017295016 = score(doc=1789,freq=2.0), product of:
            0.2235069 = queryWeight, product of:
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.06382575 = queryNorm
            0.07738023 = fieldWeight in 1789, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.015625 = fieldNorm(doc=1789)
      0.5 = coord(2/4)
    
    Date
    23. 3.2008 19:10:22
    Footnote
    Rez. in: JASIST 54(2003) no.9, S.905-906 (C.A. Badurek): "Visual approaches for knowledge discovery in very large databases are a prime research need for information scientists focused an extracting meaningful information from the ever growing stores of data from a variety of domains, including business, the geosciences, and satellite and medical imagery. This work presents a summary of research efforts in the fields of data mining, knowledge discovery, and data visualization with the goal of aiding the integration of research approaches and techniques from these major fields. The editors, leading computer scientists from academia and industry, present a collection of 32 papers from contributors who are incorporating visualization and data mining techniques through academic research as well application development in industry and government agencies. Information Visualization focuses upon techniques to enhance the natural abilities of humans to visually understand data, in particular, large-scale data sets. It is primarily concerned with developing interactive graphical representations to enable users to more intuitively make sense of multidimensional data as part of the data exploration process. It includes research from computer science, psychology, human-computer interaction, statistics, and information science. Knowledge Discovery in Databases (KDD) most often refers to the process of mining databases for previously unknown patterns and trends in data. Data mining refers to the particular computational methods or algorithms used in this process. The data mining research field is most related to computational advances in database theory, artificial intelligence and machine learning. This work compiles research summaries from these main research areas in order to provide "a reference work containing the collection of thoughts and ideas of noted researchers from the fields of data mining and data visualization" (p. 8). It addresses these areas in three main sections: the first an data visualization, the second an KDD and model visualization, and the last an using visualization in the knowledge discovery process. The seven chapters of Part One focus upon methodologies and successful techniques from the field of Data Visualization. Hoffman and Grinstein (Chapter 2) give a particularly good overview of the field of data visualization and its potential application to data mining. An introduction to the terminology of data visualization, relation to perceptual and cognitive science, and discussion of the major visualization display techniques are presented. Discussion and illustration explain the usefulness and proper context of such data visualization techniques as scatter plots, 2D and 3D isosurfaces, glyphs, parallel coordinates, and radial coordinate visualizations. Remaining chapters present the need for standardization of visualization methods, discussion of user requirements in the development of tools, and examples of using information visualization in addressing research problems.
    In 13 chapters, Part Two provides an introduction to KDD, an overview of data mining techniques, and examples of the usefulness of data model visualizations. The importance of visualization throughout the KDD process is stressed in many of the chapters. In particular, the need for measures of visualization effectiveness, benchmarking for identifying best practices, and the use of standardized sample data sets is convincingly presented. Many of the important data mining approaches are discussed in this complementary context. Cluster and outlier detection, classification techniques, and rule discovery algorithms are presented as the basic techniques common to the KDD process. The potential effectiveness of using visualization in the data modeling process are illustrated in chapters focused an using visualization for helping users understand the KDD process, ask questions and form hypotheses about their data, and evaluate the accuracy and veracity of their results. The 11 chapters of Part Three provide an overview of the KDD process and successful approaches to integrating KDD, data mining, and visualization in complementary domains. Rhodes (Chapter 21) begins this section with an excellent overview of the relation between the KDD process and data mining techniques. He states that the "primary goals of data mining are to describe the existing data and to predict the behavior or characteristics of future data of the same type" (p. 281). These goals are met by data mining tasks such as classification, regression, clustering, summarization, dependency modeling, and change or deviation detection. Subsequent chapters demonstrate how visualization can aid users in the interactive process of knowledge discovery by graphically representing the results from these iterative tasks. Finally, examples of the usefulness of integrating visualization and data mining tools in the domain of business, imagery and text mining, and massive data sets are provided. This text concludes with a thorough and useful 17-page index and lengthy yet integrating 17-page summary of the academic and industrial backgrounds of the contributing authors. A 16-page set of color inserts provide a better representation of the visualizations discussed, and a URL provided suggests that readers may view all the book's figures in color on-line, although as of this submission date it only provides access to a summary of the book and its contents. The overall contribution of this work is its focus an bridging two distinct areas of research, making it a valuable addition to the Morgan Kaufmann Series in Database Management Systems. The editors of this text have met their main goal of providing the first textbook integrating knowledge discovery, data mining, and visualization. Although it contributes greatly to our under- standing of the development and current state of the field, a major weakness of this text is that there is no concluding chapter to discuss the contributions of the sum of these contributed papers or give direction to possible future areas of research. "Integration of expertise between two different disciplines is a difficult process of communication and reeducation. Integrating data mining and visualization is particularly complex because each of these fields in itself must draw an a wide range of research experience" (p. 300). Although this work contributes to the crossdisciplinary communication needed to advance visualization in KDD, a more formal call for an interdisciplinary research agenda in a concluding chapter would have provided a more satisfying conclusion to a very good introductory text.
    With contributors almost exclusively from the computer science field, the intended audience of this work is heavily slanted towards a computer science perspective. However, it is highly readable and provides introductory material that would be useful to information scientists from a variety of domains. Yet, much interesting work in information visualization from other fields could have been included giving the work more of an interdisciplinary perspective to complement their goals of integrating work in this area. Unfortunately, many of the application chapters are these, shallow, and lack complementary illustrations of visualization techniques or user interfaces used. However, they do provide insight into the many applications being developed in this rapidly expanding field. The authors have successfully put together a highly useful reference text for the data mining and information visualization communities. Those interested in a good introduction and overview of complementary research areas in these fields will be satisfied with this collection of papers. The focus upon integrating data visualization with data mining complements texts in each of these fields, such as Advances in Knowledge Discovery and Data Mining (Fayyad et al., MIT Press) and Readings in Information Visualization: Using Vision to Think (Card et. al., Morgan Kauffman). This unique work is a good starting point for future interaction between researchers in the fields of data visualization and data mining and makes a good accompaniment for a course focused an integrating these areas or to the main reference texts in these fields."
  2. Fayyad, U.M.: Data mining and knowledge dicovery : making sense out of data (1996) 0.04
    0.0432256 = product of:
      0.1729024 = sum of:
        0.1729024 = weight(_text_:fields in 7007) [ClassicSimilarity], result of:
          0.1729024 = score(doc=7007,freq=2.0), product of:
            0.31604284 = queryWeight, product of:
              4.951651 = idf(docFreq=849, maxDocs=44218)
              0.06382575 = queryNorm
            0.54708534 = fieldWeight in 7007, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              4.951651 = idf(docFreq=849, maxDocs=44218)
              0.078125 = fieldNorm(doc=7007)
      0.25 = coord(1/4)
    
    Abstract
    Defines knowledge discovery and data mining (KDD) as the overall process of extracting high level knowledge from low level data. Outlines the KDD process. Explains how KDD is related to the fields of: statistics, pattern recognition, machine learning, artificial intelligence, databases and data warehouses
  3. Fayyad, U.; Piatetsky-Shapiro, G.; Smyth, P.: From data mining to knowledge discovery in databases (1996) 0.04
    0.0432256 = product of:
      0.1729024 = sum of:
        0.1729024 = weight(_text_:fields in 7458) [ClassicSimilarity], result of:
          0.1729024 = score(doc=7458,freq=2.0), product of:
            0.31604284 = queryWeight, product of:
              4.951651 = idf(docFreq=849, maxDocs=44218)
              0.06382575 = queryNorm
            0.54708534 = fieldWeight in 7458, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              4.951651 = idf(docFreq=849, maxDocs=44218)
              0.078125 = fieldNorm(doc=7458)
      0.25 = coord(1/4)
    
    Abstract
    Gives an overview of data mining and knowledge discovery in databases. Clarifies how they are related both to each other and to related fields. Mentions real world applications data mining techniques, challenges involved in real world applications of knowledge discovery, and current and future research directions
  4. Raan, A.F.J. van; Noyons, E.C.M.: Discovery of patterns of scientific and technological development and knowledge transfer (2002) 0.03
    0.030565115 = product of:
      0.12226046 = sum of:
        0.12226046 = weight(_text_:fields in 3603) [ClassicSimilarity], result of:
          0.12226046 = score(doc=3603,freq=4.0), product of:
            0.31604284 = queryWeight, product of:
              4.951651 = idf(docFreq=849, maxDocs=44218)
              0.06382575 = queryNorm
            0.38684773 = fieldWeight in 3603, product of:
              2.0 = tf(freq=4.0), with freq of:
                4.0 = termFreq=4.0
              4.951651 = idf(docFreq=849, maxDocs=44218)
              0.0390625 = fieldNorm(doc=3603)
      0.25 = coord(1/4)
    
    Abstract
    This paper addresses a bibliometric methodology to discover the structure of the scientific 'landscape' in order to gain detailed insight into the development of MD fields, their interaction, and the transfer of knowledge between them. This methodology is appropriate to visualize the position of MD activities in relation to interdisciplinary MD developments, and particularly in relation to socio-economic problems. Furthermore, it allows the identification of the major actors. It even provides the possibility of foresight. We describe a first approach to apply bibliometric mapping as an instrument to investigate characteristics of knowledge transfer. In this paper we discuss the creation of 'maps of science' with help of advanced bibliometric methods. This 'bibliometric cartography' can be seen as a specific type of data-mining, applied to large amounts of scientific publications. As an example we describe the mapping of the field neuroscience, one of the largest and fast growing fields in the life sciences. The number of publications covered by this database is about 80,000 per year, the period covered is 1995-1998. Current research is going an to update the mapping for the years 1999-2002. This paper addresses the main lines of the methodology and its application in the study of knowledge transfer.
  5. Suakkaphong, N.; Zhang, Z.; Chen, H.: Disease named entity recognition using semisupervised learning and conditional random fields (2011) 0.03
    0.030565115 = product of:
      0.12226046 = sum of:
        0.12226046 = weight(_text_:fields in 4367) [ClassicSimilarity], result of:
          0.12226046 = score(doc=4367,freq=4.0), product of:
            0.31604284 = queryWeight, product of:
              4.951651 = idf(docFreq=849, maxDocs=44218)
              0.06382575 = queryNorm
            0.38684773 = fieldWeight in 4367, product of:
              2.0 = tf(freq=4.0), with freq of:
                4.0 = termFreq=4.0
              4.951651 = idf(docFreq=849, maxDocs=44218)
              0.0390625 = fieldNorm(doc=4367)
      0.25 = coord(1/4)
    
    Abstract
    Information extraction is an important text-mining task that aims at extracting prespecified types of information from large text collections and making them available in structured representations such as databases. In the biomedical domain, information extraction can be applied to help biologists make the most use of their digital-literature archives. Currently, there are large amounts of biomedical literature that contain rich information about biomedical substances. Extracting such knowledge requires a good named entity recognition technique. In this article, we combine conditional random fields (CRFs), a state-of-the-art sequence-labeling algorithm, with two semisupervised learning techniques, bootstrapping and feature sampling, to recognize disease names from biomedical literature. Two data-processing strategies for each technique also were analyzed: one sequentially processing unlabeled data partitions and another one processing unlabeled data partitions in a round-robin fashion. The experimental results showed the advantage of semisupervised learning techniques given limited labeled training data. Specifically, CRFs with bootstrapping implemented in sequential fashion outperformed strictly supervised CRFs for disease name recognition. The project was supported by NIH/NLM Grant R33 LM07299-01, 2002-2005.
  6. Tu, Y.-N.; Hsu, S.-L.: Constructing conceptual trajectory maps to trace the development of research fields (2016) 0.03
    0.030565115 = product of:
      0.12226046 = sum of:
        0.12226046 = weight(_text_:fields in 3059) [ClassicSimilarity], result of:
          0.12226046 = score(doc=3059,freq=4.0), product of:
            0.31604284 = queryWeight, product of:
              4.951651 = idf(docFreq=849, maxDocs=44218)
              0.06382575 = queryNorm
            0.38684773 = fieldWeight in 3059, product of:
              2.0 = tf(freq=4.0), with freq of:
                4.0 = termFreq=4.0
              4.951651 = idf(docFreq=849, maxDocs=44218)
              0.0390625 = fieldNorm(doc=3059)
      0.25 = coord(1/4)
    
    Abstract
    This study proposes a new method to construct and trace the trajectory of conceptual development of a research field by combining main path analysis, citation analysis, and text-mining techniques. Main path analysis, a method used commonly to trace the most critical path in a citation network, helps describe the developmental trajectory of a research field. This study extends the main path analysis method and applies text-mining techniques in the new method, which reflects the trajectory of conceptual development in an academic research field more accurately than citation frequency, which represents only the articles examined. Articles can be merged based on similarity of concepts, and by merging concepts the history of a research field can be described more precisely. The new method was applied to the "h-index" and "text mining" fields. The precision, recall, and F-measures of the h-index were 0.738, 0.652, and 0.658 and those of text-mining were 0.501, 0.653, and 0.551, respectively. Last, this study not only establishes the conceptual trajectory map of a research field, but also recommends keywords that are more precise than those used currently by researchers. These precise keywords could enable researchers to gather related works more quickly than before.
  7. Chowdhury, G.G.: Template mining for information extraction from digital documents (1999) 0.03
    0.030266277 = product of:
      0.12106511 = sum of:
        0.12106511 = weight(_text_:22 in 4577) [ClassicSimilarity], result of:
          0.12106511 = score(doc=4577,freq=2.0), product of:
            0.2235069 = queryWeight, product of:
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.06382575 = queryNorm
            0.5416616 = fieldWeight in 4577, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.109375 = fieldNorm(doc=4577)
      0.25 = coord(1/4)
    
    Date
    2. 4.2000 18:01:22
  8. KDD : techniques and applications (1998) 0.03
    0.025942523 = product of:
      0.10377009 = sum of:
        0.10377009 = weight(_text_:22 in 6783) [ClassicSimilarity], result of:
          0.10377009 = score(doc=6783,freq=2.0), product of:
            0.2235069 = queryWeight, product of:
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.06382575 = queryNorm
            0.46428138 = fieldWeight in 6783, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.09375 = fieldNorm(doc=6783)
      0.25 = coord(1/4)
    
    Footnote
    A special issue of selected papers from the Pacific-Asia Conference on Knowledge Discovery and Data Mining (PAKDD'97), held Singapore, 22-23 Feb 1997
  9. Relational data mining (2001) 0.03
    0.02593536 = product of:
      0.10374144 = sum of:
        0.10374144 = weight(_text_:fields in 1303) [ClassicSimilarity], result of:
          0.10374144 = score(doc=1303,freq=2.0), product of:
            0.31604284 = queryWeight, product of:
              4.951651 = idf(docFreq=849, maxDocs=44218)
              0.06382575 = queryNorm
            0.32825118 = fieldWeight in 1303, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              4.951651 = idf(docFreq=849, maxDocs=44218)
              0.046875 = fieldNorm(doc=1303)
      0.25 = coord(1/4)
    
    Abstract
    As the first book devoted to relational data mining, this coherently written multi-author monograph provides a thorough introduction and systematic overview of the area. The ferst part introduces the reader to the basics and principles of classical knowledge discovery in databases and inductive logic programmeng; subsequent chapters by leading experts assess the techniques in relational data mining in a principled and comprehensive way; finally, three chapters deal with advanced applications in various fields and refer the reader to resources for relational data mining. This book will become a valuable source of reference for R&D professionals active in relational data mining. Students as well as IT professionals and ambitioned practitioners interested in learning about relational data mining will appreciate the book as a useful text and gentle introduction to this exciting new field.
  10. Liu, X.; Yu, S.; Janssens, F.; Glänzel, W.; Moreau, Y.; Moor, B.de: Weighted hybrid clustering by combining text mining and bibliometrics on a large-scale journal database (2010) 0.03
    0.02593536 = product of:
      0.10374144 = sum of:
        0.10374144 = weight(_text_:fields in 3464) [ClassicSimilarity], result of:
          0.10374144 = score(doc=3464,freq=2.0), product of:
            0.31604284 = queryWeight, product of:
              4.951651 = idf(docFreq=849, maxDocs=44218)
              0.06382575 = queryNorm
            0.32825118 = fieldWeight in 3464, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              4.951651 = idf(docFreq=849, maxDocs=44218)
              0.046875 = fieldNorm(doc=3464)
      0.25 = coord(1/4)
    
    Abstract
    We propose a new hybrid clustering framework to incorporate text mining with bibliometrics in journal set analysis. The framework integrates two different approaches: clustering ensemble and kernel-fusion clustering. To improve the flexibility and the efficiency of processing large-scale data, we propose an information-based weighting scheme to leverage the effect of multiple data sources in hybrid clustering. Three different algorithms are extended by the proposed weighting scheme and they are employed on a large journal set retrieved from the Web of Science (WoS) database. The clustering performance of the proposed algorithms is systematically evaluated using multiple evaluation methods, and they were cross-compared with alternative methods. Experimental results demonstrate that the proposed weighted hybrid clustering strategy is superior to other methods in clustering performance and efficiency. The proposed approach also provides a more refined structural mapping of journal sets, which is useful for monitoring and detecting new trends in different scientific fields.
  11. Borgman, C.L.; Wofford, M.F.; Golshan, M.S.; Darch, P.T.: Collaborative qualitative research at scale : reflections on 20 years of acquiring global data and making data global (2021) 0.02
    0.0216128 = product of:
      0.0864512 = sum of:
        0.0864512 = weight(_text_:fields in 239) [ClassicSimilarity], result of:
          0.0864512 = score(doc=239,freq=2.0), product of:
            0.31604284 = queryWeight, product of:
              4.951651 = idf(docFreq=849, maxDocs=44218)
              0.06382575 = queryNorm
            0.27354267 = fieldWeight in 239, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              4.951651 = idf(docFreq=849, maxDocs=44218)
              0.0390625 = fieldNorm(doc=239)
      0.25 = coord(1/4)
    
    Abstract
    A 5-year project to study scientific data uses in geography, starting in 1999, evolved into 20 years of research on data practices in sensor networks, environmental sciences, biology, seismology, undersea science, biomedicine, astronomy, and other fields. By emulating the "team science" approaches of the scientists studied, the UCLA Center for Knowledge Infrastructures accumulated a comprehensive collection of qualitative data about how scientists generate, manage, use, and reuse data across domains. Building upon Paul N. Edwards's model of "making global data"-collecting signals via consistent methods, technologies, and policies-to "make data global"-comparing and integrating those data, the research team has managed and exploited these data as a collaborative resource. This article reflects on the social, technical, organizational, economic, and policy challenges the team has encountered in creating new knowledge from data old and new. We reflect on continuity over generations of students and staff, transitions between grants, transfer of legacy data between software tools, research methods, and the role of professional data managers in the social sciences.
  12. Matson, L.D.; Bonski, D.J.: Do digital libraries need librarians? (1997) 0.02
    0.017295016 = product of:
      0.069180064 = sum of:
        0.069180064 = weight(_text_:22 in 1737) [ClassicSimilarity], result of:
          0.069180064 = score(doc=1737,freq=2.0), product of:
            0.2235069 = queryWeight, product of:
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.06382575 = queryNorm
            0.30952093 = fieldWeight in 1737, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.0625 = fieldNorm(doc=1737)
      0.25 = coord(1/4)
    
    Date
    22.11.1998 18:57:22
  13. Lusti, M.: Data Warehousing and Data Mining : Eine Einführung in entscheidungsunterstützende Systeme (1999) 0.02
    0.017295016 = product of:
      0.069180064 = sum of:
        0.069180064 = weight(_text_:22 in 4261) [ClassicSimilarity], result of:
          0.069180064 = score(doc=4261,freq=2.0), product of:
            0.2235069 = queryWeight, product of:
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.06382575 = queryNorm
            0.30952093 = fieldWeight in 4261, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.0625 = fieldNorm(doc=4261)
      0.25 = coord(1/4)
    
    Date
    17. 7.2002 19:22:06
  14. Amir, A.; Feldman, R.; Kashi, R.: ¬A new and versatile method for association generation (1997) 0.02
    0.017295016 = product of:
      0.069180064 = sum of:
        0.069180064 = weight(_text_:22 in 1270) [ClassicSimilarity], result of:
          0.069180064 = score(doc=1270,freq=2.0), product of:
            0.2235069 = queryWeight, product of:
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.06382575 = queryNorm
            0.30952093 = fieldWeight in 1270, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.0625 = fieldNorm(doc=1270)
      0.25 = coord(1/4)
    
    Source
    Information systems. 22(1997) nos.5/6, S.333-347
  15. Hofstede, A.H.M. ter; Proper, H.A.; Van der Weide, T.P.: Exploiting fact verbalisation in conceptual information modelling (1997) 0.02
    0.015133139 = product of:
      0.060532555 = sum of:
        0.060532555 = weight(_text_:22 in 2908) [ClassicSimilarity], result of:
          0.060532555 = score(doc=2908,freq=2.0), product of:
            0.2235069 = queryWeight, product of:
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.06382575 = queryNorm
            0.2708308 = fieldWeight in 2908, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.0546875 = fieldNorm(doc=2908)
      0.25 = coord(1/4)
    
    Source
    Information systems. 22(1997) nos.5/6, S.349-385
  16. Lackes, R.; Tillmanns, C.: Data Mining für die Unternehmenspraxis : Entscheidungshilfen und Fallstudien mit führenden Softwarelösungen (2006) 0.01
    0.0129712615 = product of:
      0.051885046 = sum of:
        0.051885046 = weight(_text_:22 in 1383) [ClassicSimilarity], result of:
          0.051885046 = score(doc=1383,freq=2.0), product of:
            0.2235069 = queryWeight, product of:
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.06382575 = queryNorm
            0.23214069 = fieldWeight in 1383, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.046875 = fieldNorm(doc=1383)
      0.25 = coord(1/4)
    
    Date
    22. 3.2008 14:46:06
  17. Hallonsten, O.; Holmberg, D.: Analyzing structural stratification in the Swedish higher education system : data contextualization with policy-history analysis (2013) 0.01
    0.010809385 = product of:
      0.04323754 = sum of:
        0.04323754 = weight(_text_:22 in 668) [ClassicSimilarity], result of:
          0.04323754 = score(doc=668,freq=2.0), product of:
            0.2235069 = queryWeight, product of:
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.06382575 = queryNorm
            0.19345059 = fieldWeight in 668, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.0390625 = fieldNorm(doc=668)
      0.25 = coord(1/4)
    
    Date
    22. 3.2013 19:43:01
  18. Vaughan, L.; Chen, Y.: Data mining from web search queries : a comparison of Google trends and Baidu index (2015) 0.01
    0.010809385 = product of:
      0.04323754 = sum of:
        0.04323754 = weight(_text_:22 in 1605) [ClassicSimilarity], result of:
          0.04323754 = score(doc=1605,freq=2.0), product of:
            0.2235069 = queryWeight, product of:
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.06382575 = queryNorm
            0.19345059 = fieldWeight in 1605, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.0390625 = fieldNorm(doc=1605)
      0.25 = coord(1/4)
    
    Source
    Journal of the Association for Information Science and Technology. 66(2015) no.1, S.13-22
  19. Fonseca, F.; Marcinkowski, M.; Davis, C.: Cyber-human systems of thought and understanding (2019) 0.01
    0.010809385 = product of:
      0.04323754 = sum of:
        0.04323754 = weight(_text_:22 in 5011) [ClassicSimilarity], result of:
          0.04323754 = score(doc=5011,freq=2.0), product of:
            0.2235069 = queryWeight, product of:
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.06382575 = queryNorm
            0.19345059 = fieldWeight in 5011, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.0390625 = fieldNorm(doc=5011)
      0.25 = coord(1/4)
    
    Date
    7. 3.2019 16:32:22
  20. Peters, G.; Gaese, V.: ¬Das DocCat-System in der Textdokumentation von G+J (2003) 0.01
    0.008647508 = product of:
      0.034590032 = sum of:
        0.034590032 = weight(_text_:22 in 1507) [ClassicSimilarity], result of:
          0.034590032 = score(doc=1507,freq=2.0), product of:
            0.2235069 = queryWeight, product of:
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.06382575 = queryNorm
            0.15476047 = fieldWeight in 1507, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.03125 = fieldNorm(doc=1507)
      0.25 = coord(1/4)
    
    Date
    22. 4.2003 11:45:36

Years

Languages

  • e 17
  • d 7

Types