Journal Citation Reports JCR – Clarivate (original) (raw)
A key difference between the Web of Science and Journal Citation Reports is that the Web of Science is continually updated, while the JCR data represent a snapshot from a specific time, namely, the date when the data were extracted for analysis. This difference reflects the essential nature of each product.
The Web of Science is an evolving record of the dynamic world of scholarly communication with new source content continually added, including citations. JCR, on the other hand, is an annual report on the citation impact of a defined set of journals at a given moment in time.
Therefore, attempts to use the Web of Science data to replicate JCR metrics will lead to results that will vary from those reported in JCR.