What is quartile ranking?

In Journal Citation Reports, the quartile rankings are defined based on rank for the Journal Impact Factor. In Journal Citation Reports, quartiles are defined as the following:

Q1: 0% < Z ≤ 25% Highest ranked journals in a category
Q2: 25% < Z ≤ 50%
Q3: 50% < Z ≤ 75%
Q4: 75% < Z Lowest ranked journals in a category

Z is defined as:

Z=(X/Y)

Where X is the journal rank in category and Y is the number of journals in the category.

Examples:
When sorted by Impact Factor, if a journal is rank 78 out of 314 in a category, Z=(78/314)=0.248 which is a Q1 journal.
When sorted by Impact Factor, if a journal is rank 102 out of 204 in a category, Z=(102/204)=0.5 which is a Q2 journal.

(Clarivate Analytics)

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