noun, noun which may take the genitive case particle 'no'
quartile
Statistical term referring to any of the three values that divide a sorted data set into four equal parts. Often used with 第 (だい) to specify first, second, or third quartile.
Analyze the data by dividing it into quartiles.
The difference between the first and third quartiles is called the interquartile range.
Compound of 四 (four) + 分 (divide) + 位 (rank/position), a straightforward calque from English 'quartile'.