Some modifications to the SNIP journal impact indicator

Some modifications to the SNIP journal impact indicator

The SNIP (source normalized impact per paper) indicator is an indicator of the citation impact of scientific journals. The indicator, introduced by Henk Moed in 2010, is included in Elsevier’s Scopus database. The SNIP indicator uses a source normalized approach to correct for differences in citation practices between scientific fields. The strength of this approach is that it does not require ...

Scopus' SNIP Indicator

1. The SNIP indicator of Elsevier’s Scopus cannot be considered as a statistics because it is based on dividing the mean of a distribution by the value of the median of another distribution. Using this ratio, one is no longer able to indicate the standard error or to test for the significance of differences between journals or journal groups. In our opinion, one should first normalize and then ...

The Source-Normalized Impact per Paper (SNIP) is a valid and sophisticated indicator of journal citation impact

Many authors have underlined that it is improper to make comparisons between citation counts generated in different research fields, because citation practices can vary significantly from one field to another. For instance, articles in biochemistry often contain over 50 cited references, while a typical mathematical paper has perhaps only 10. This difference explains why biochemical papers are ...

The revised SNIP indicator of Elsevier's Scopus

The modified SNIP indicator of Elsevier, as recently explained by Waltman et al. SNIP value was obtained by dividing an arithmetic average in the numerator by a median value in the denominator which results in a quotient without the possibility of specifying the statistical uncertainty in the indicator. Instead of dividing aggregates, one should normalize observed against expected values in ter...

SNIP Journal Impact Indicator Accounts for Differences in Citation Characteristics and Database Coverage Between Properly Defined Subject Fields