InformeDesign: Glossary of Terms

quartile
(quartiles; Quartile; Quartiles)

A range of a data set that contains 25% (or one quarter) of all the variables. There are always four in any data set. Percentiles correlate accordingly -- 25th percentile (1st quartile), 50th percentile (2nd quartile), 75th percentile (3rd quartile), et cetera.