Definition:Quartile/First
< Definition:Quartile(Redirected from Definition:Lower Quartile)
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Definition
Let $D$ be a finite collection of data regarding some quantitative variable.
The first quartile of $D$ is defined as the median of the data values in $D$ below and not including the second quartile $Q_2$.
It is commonly denoted $Q_1$.
Also known as
The first quartile is often referred to as the lower quartile.
Also see
- Results about quartiles can be found here.
Sources
- 1989: Ephraim J. Borowski and Jonathan M. Borwein: Dictionary of Mathematics ... (previous) ... (next): quartile
- 2011: Charles Henry Brase and Corrinne Pellillo Brase: Understandable Statistics (10th ed.): $\S 3.3$