Search (3 results, page 1 of 1)

Egghe, L.; Ravichandra Rao, I.K.: ¬The influence of the broadness of a query of a topic on its h-index : models and examples of the h-index of n-grams (2008) 0.00
```
0.001302523 = product of:
  0.002605046 = sum of:
    0.002605046 = product of:
      0.005210092 = sum of:
        0.005210092 = weight(_text_:s in 2009) [ClassicSimilarity], result of:
          0.005210092 = score(doc=2009,freq=6.0), product of:
            0.05008241 = queryWeight, product of:
              1.0872376 = idf(docFreq=40523, maxDocs=44218)
              0.046063907 = queryNorm
            0.10403037 = fieldWeight in 2009, product of:
              2.4494898 = tf(freq=6.0), with freq of:
                6.0 = termFreq=6.0
              1.0872376 = idf(docFreq=40523, maxDocs=44218)
              0.0390625 = fieldNorm(doc=2009)
      0.5 = coord(1/2)
  0.5 = coord(1/2)
```
Abstract

The article studies the influence of the query formulation of a topic on its h-index. In order to generate pure random sets of documents, we used N-grams (N variable) to measure this influence: strings of zeros, truncated at the end. The used databases are WoS and Scopus. The formula h=T**1/alpha, proved in Egghe and Rousseau (2006) where T is the number of retrieved documents and is Lotka's exponent, is confirmed being a concavely increasing function of T. We also give a formula for the relation between h and N the length of the N-gram: h=D10**(-N/alpha) where D is a constant, a convexly decreasing function, which is found in our experiments. Nonlinear regression on h=T**1/alpha gives an estimation of , which can then be used to estimate the h-index of the entire database (Web of Science [WoS] and Scopus): h=S**1/alpha, , where S is the total number of documents in the database.

Source

Journal of the American Society for Information Science and Technology. 59(2008) no.10, S.1688-1693

Egghe, L.; Ravichandra Rao, I.K.: Duality revisited : construction of fractional frequency distributions based on two dual Lotka laws (2002) 0.00

9.0241426E-4 = product of:
  0.0018048285 = sum of:
    0.0018048285 = product of:
      0.003609657 = sum of:
        0.003609657 = weight(_text_:s in 1006) [ClassicSimilarity], result of:
          0.003609657 = score(doc=1006,freq=2.0), product of:
            0.05008241 = queryWeight, product of:
              1.0872376 = idf(docFreq=40523, maxDocs=44218)
              0.046063907 = queryNorm
            0.072074346 = fieldWeight in 1006, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              1.0872376 = idf(docFreq=40523, maxDocs=44218)
              0.046875 = fieldNorm(doc=1006)
      0.5 = coord(1/2)
  0.5 = coord(1/2)

Source: Journal of the American Society for Information Science and technology. 53(2002) no.10, S.789-801

Egghe, L.; Ravichandra Rao, I.K.: Study of different h-indices for groups of authors (2008) 0.00

9.0241426E-4 = product of:
  0.0018048285 = sum of:
    0.0018048285 = product of:
      0.003609657 = sum of:
        0.003609657 = weight(_text_:s in 1878) [ClassicSimilarity], result of:
          0.003609657 = score(doc=1878,freq=2.0), product of:
            0.05008241 = queryWeight, product of:
              1.0872376 = idf(docFreq=40523, maxDocs=44218)
              0.046063907 = queryNorm
            0.072074346 = fieldWeight in 1878, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              1.0872376 = idf(docFreq=40523, maxDocs=44218)
              0.046875 = fieldNorm(doc=1878)
      0.5 = coord(1/2)
  0.5 = coord(1/2)

Source: Journal of the American Society for Information Science and Technology. 59(2008) no.8, S.1276-1281