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The Center for Science and Technology Studies at Leiden University advocatesthe use of specific normalizations for assessing research performance withreference to a world average. The Journal Citation Score (JCS) and FieldCitation Score (FCS) are averaged for the research group or individualresearcher under study, and then these values are used as denominators of the(mean) Citations per publication (CPP). Thus, this normalization is based ondividing two averages. This procedure only generates a legitimate indicator inthe case of underlying normal distributions. Given the skewed distributionsunder study, one should average the observed versus expected values which areto be divided first for each publication. We show the effects of the Leidennormalization for a recent evaluation where we happened to have access to theunderlying data.

Caveats for the journal and field normalizations in the CWTS ("Leiden") evaluations of research performance