Statistics Toolbox™

prctile - Percentiles

Syntax

Y = prctile(X,p) Y = prctile(X,p,dim)

Description

Y = prctile(X,p) returns percentiles of the values in X. p is a scalar or a vector of percent values. When X is a vector, Y is the same size as p and Y(i) contains the p(i)th percentile. When X is a matrix, the ith row of Y contains the p(i)th percentiles of each column of X. For N-dimensional arrays, prctile operates along the first nonsingleton dimension of X.

Y = prctile(X,p,dim) calculates percentiles along dimension dim. The dim'th dimension of Y has length length(p).

Percentiles are specified using percentages, from 0 to 100. For an n-element vector X, prctile computes percentiles as follows:

The sorted values in X are taken to be the 100(0.5/n), 100(1.5/n), ..., 100([n-0.5]/n) percentiles.
Linear interpolation is used to compute percentiles for percent values between 100(0.5/n) and 100([n-0.5]/n).
The minimum or maximum values in X are assigned to percentiles for percent values outside that range.

prctile treats NaNs as missing values and removes them.

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

posterior (NaiveBayes)

predict (CompactTreeBagger)

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