Quartiles in JCR on the InCites Platform

Quartiles are defined as the following:

X = the journal rank in category according to the metric (Journal Impact Factor, Total Citations, etc)

Y = the number of journals in the category.

Z = Percentile rank (X/Y)

Q1: 0.0 < Z ≤ 0.25

Q2: 0.25 < Z ≤ 0.5

Q3: 0.5 < Z ≤ 0.75

Q4: 0.75 < Z

Where quartile data differs between JCR on the Web of Science platform and JCR on the InCites platform, the latter should be the source of record for official quartiles.