Article level metrics measure the usage and impact of individual scholarly articles, including the number of citations, downloads, and altmetrics. The most used article level metrics are Field Weighted Citation Impact (FWCI) and Citation Percentile; they are field normalised metrics.
FWCI indicators can also be calculated at the article level. This calculation is a ratio of the number of citations received by an article compared to the average or expected number of citations received by similar publications.
Example: A FWCI of 1.00 means that the output performs just as expected for the global average. Whereas a score of 1.48 indicates the output is cited 48% more than expected.
A citation percentile measures the number of citations for an article against a benchmark set of similar papers (in terms of field, publication year and document type). An article with no citations has a percentile of 0, and the article with the most citations has a percentile score of 100.
Example: If an article is ranked in the 99th citation percentile, it is in the top 1% of most cited papers from similar papers in the field.