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In [[statistics]], a '''quartile''' is a type of [[quantile]] which divides the number of data points into four parts, or ''quarters'', of more-or-less equal size. The data must be ordered from smallest to largest to compute quartiles; as such, quartiles are a form of [[order statistic]]. The three main quartiles are as follows:
* The first quartile (''Q''<sub>1</sub>) is defined as the middle number between the smallest number ([[Sample minimum|minimum]]) and the [[median]] of the data set. It is also known as the ''lower'' or ''25th empirical'' quartile, as 25% of the data is below this point.
* The second quartile (''Q''<sub>2</sub>) is the median of a data set; thus 50% of the data lies below this point.