Abstract
In this paper we present a compilation of journal impact properties in relation to other bibliometric indicators as found in our earlier studies together with new results. We argue that journal impact, even calculated in a sufficiently advanced way, becomes important in evaluation practices based on bibliometric analysis only at an aggregate level. In the relation between average journal impact and actual citation impact of groups, the influence of research performance is substantial. Top-performance as well as lower performance groups publish in more or less the same range of journal impact values, but top-performance groups are, on average, more successful in the entire range of journal impact. We find that for the high field citation-density groups a larger size implies a lower average journal impact. For groups in the low field citation-density regions however a larger size implies a considerably higher average journal impact. Finally, we found that top-performance groups have relatively less self-citations than the lower performance groups and this fraction is decreasing with journal impact.
Highlights
In this paper we present a compilation of journal impact properties in relation to other bibliometric indicators as found in our earlier studies together with new results
In this paper we argue that journal impact, even calculated in a sufficiently advanced way, becomes important in evaluation practices based on bibliometric analysis only at an aggregate level
We present results on four main topics: the distribution of journal impact over individual publications and over research groups; the relation between journal impact and actual citation impact of groups and the influence of research performance; the group-size dependence of journal impact in relation to fieldspecific citation density; and the relation between journal impact and self-citation
Summary
Number of publications (P) in WoS-covered journals of a specific entity in a given time period. Average journal impact for each journal used by the specific entity (JCS, journal citation score), without self-citations; as almost always a set of journals is used, we calculate the weighted average JCSm; for the calculation of JCSm the same publication and citation counting procedure, time windows, and article types are used as in the case of CPP. Comparison of the received impact of the specific entity with the world-wide average based on FCSm as a standard, without self-citations, indicator CPP/FCSm. Ratio JCSm/FCSm indicating whether the impact of a journal is above (ratio [1) or below (ratio \1) the field average.
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