Author metrics are citation-based metrics used to measure a researcher or academic's publication impact. They include the volume of research publications, the number of citations per publication, and the performance of these publications.
The H-index measures both the productivity and citation impact of publications. It is one of the most common author measures and is best applied when comparing authors from the same field of research, as citation practice can differ greatly between areas.
Example: If an author with an h-index of 6 has at least six journal articles that have each been cited at least six times.
Field Weighted Citation Impact (FWCI) and Category Normalized Citation Impact (CNCI) are field normalised metrics considering the differences in research behaviour across disciplines. They are useful for researchers working in several disciplines or when comparing disciplines. However, there are limitations to the indicators. For example, they ignore the total volume of research outputs. When dealing with small sets of publications, the FWCI and CNCI values may be inflated by a single highly cited paper.
FWCI
FWCI is a Scopus indicator based on the ratio of total citations received for output to the total citations expected, based on the global average of the subject field.
Example: A FWCI of 1.00 means that the output performs just as expected for the global average. A score of 1.48 indicates the work is cited 48% more than expected.