Statistics Toolbox

prctile

Percentiles of a sample

Syntax

• Y = prctile(X,p)
  

Description

Y = prctile(X,p) calculates a value that is greater than p percent of the values in X. The values of p must lie in the interval [0 100].

For vectors, prctile(X,p) is the pth percentile of the elements in X. For instance, if p = 50 then Y is the median of X.

For matrix X and scalar p, prctile(X,p) is a row vector containing the pth percentile of each column. If p is a vector, the ith row of Y is p(i) of X.

Examples

• x = (1:5)'*(1:5)
  x =
       1     2     3     4     5
       2     4     6     8    10
       3     6     9    12    15
       4     8    12    16    20
       5    10    15    20    25
  y = prctile(x,[25 50 75])
  y =
      1.7500    3.5000    5.2500    7.0000    8.7500
      3.0000    6.0000    9.0000   12.0000   15.0000
      4.2500    8.5000   12.7500   17.0000   21.2500
  

polyval

princomp