The percentile (this term was first used by Galton, 1885a) of a distribution
of values is a number

Similarly, the 75th percentile (also referred to as the .75 quantile or upper quartile) is a value such that 75% of the values of the variable fall below that value and is calculated accordingly. You can specify the method of computing percentiles in the Options dialog box - Analyses/Graphs: Limits tab. For more information, see Percentile Calculation Options in STATISTICA. User-specified percentiles can be calculated in Nonparametrics.