Statistics Dictionary
To see a definition, select a term from the dropdown text box below. The statistics
dictionary will display the definition, plus links to related web pages.
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Quartile
Quartiles divide a rank-ordered data set into
four equal parts. The values that divide each part are called
the first, second, and third quartiles; and they are denoted by
Q1, Q2, and Q3, respectively.
Note the relationship between quartiles and
percentiles.
Q1 corresponds to P25,
Q2 corresponds to P50,
Q3 corresponds to P75. Q2
is the
median value in a set of data.
