-
Bar-Ilan, J.; Levene, M.: ¬The hw-rank : an h-index variant for ranking web pages (2015)
0.01
0.005731291 = product of:
0.017193872 = sum of:
0.017193872 = product of:
0.051581617 = sum of:
0.051581617 = weight(_text_:retrieval in 1694) [ClassicSimilarity], result of:
0.051581617 = score(doc=1694,freq=2.0), product of:
0.15433937 = queryWeight, product of:
3.024915 = idf(docFreq=5836, maxDocs=44218)
0.051022716 = queryNorm
0.33420905 = fieldWeight in 1694, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.024915 = idf(docFreq=5836, maxDocs=44218)
0.078125 = fieldNorm(doc=1694)
0.33333334 = coord(1/3)
0.33333334 = coord(1/3)
- Footnote
- Beitrag in einem Special Issue "Combining bibliometrics and information retrieval"
-
Bar-Ilan, J.: On the overlap, the precision and estimated recall of search engines : a case study of the query 'Erdös' (1998)
0.01
0.005673688 = product of:
0.017021064 = sum of:
0.017021064 = product of:
0.05106319 = sum of:
0.05106319 = weight(_text_:retrieval in 3753) [ClassicSimilarity], result of:
0.05106319 = score(doc=3753,freq=4.0), product of:
0.15433937 = queryWeight, product of:
3.024915 = idf(docFreq=5836, maxDocs=44218)
0.051022716 = queryNorm
0.33085006 = fieldWeight in 3753, product of:
2.0 = tf(freq=4.0), with freq of:
4.0 = termFreq=4.0
3.024915 = idf(docFreq=5836, maxDocs=44218)
0.0546875 = fieldNorm(doc=3753)
0.33333334 = coord(1/3)
0.33333334 = coord(1/3)
- Abstract
- Investigates the retrieval capabilities of 6 Internet search engines on a simple query. Existing work on search engine evaluation considers only the first 10 or 20 results returned by the search engine. In this work, all documents that the search engine pointed at were retrieved and thoroughly examined. Thus the precision of the whole retrieval process could be calculated, the overlap between the results of the engines studied, and an estimate on the recall of the searches given. The precision of the engines is high, recall is very low and the overlap is minimal
-
Shema, H.; Bar-Ilan, J.; Thelwall, M.: Do blog citations correlate with a higher number of future citations? : Research blogs as a potential source for alternative metrics (2014)
0.00
0.0034615172 = product of:
0.010384551 = sum of:
0.010384551 = product of:
0.031153653 = sum of:
0.031153653 = weight(_text_:online in 1258) [ClassicSimilarity], result of:
0.031153653 = score(doc=1258,freq=2.0), product of:
0.1548489 = queryWeight, product of:
3.0349014 = idf(docFreq=5778, maxDocs=44218)
0.051022716 = queryNorm
0.20118743 = fieldWeight in 1258, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.0349014 = idf(docFreq=5778, maxDocs=44218)
0.046875 = fieldNorm(doc=1258)
0.33333334 = coord(1/3)
0.33333334 = coord(1/3)
- Abstract
- Journal-based citations are an important source of data for impact indices. However, the impact of journal articles extends beyond formal scholarly discourse. Measuring online scholarly impact calls for new indices, complementary to the older ones. This article examines a possible alternative metric source, blog posts aggregated at ResearchBlogging.org, which discuss peer-reviewed articles and provide full bibliographic references. Articles reviewed in these blogs therefore receive "blog citations." We hypothesized that articles receiving blog citations close to their publication time receive more journal citations later than the articles in the same journal published in the same year that did not receive such blog citations. Statistically significant evidence for articles published in 2009 and 2010 support this hypothesis for seven of 12 journals (58%) in 2009 and 13 of 19 journals (68%) in 2010. We suggest, based on these results, that blog citations can be used as an alternative metric source.
