quantile - Quantiles
Syntax
Y = quantile(X,p)
Y = quantile(X,p,dim)
Description
Y = quantile(X,p) returns quantiles of
the values in X. p is a scalar
or a vector of cumulative probability values. When X is
a vector, Y is the same size as p,
and Y(i) contains the p(i)th
quantile. When X is a matrix, the ith
row of Y contains the p(i)th
quantiles of each column of X. For N-dimensional
arrays, quantile operates along the first nonsingleton
dimension of X.
Y = quantile(X,p,dim) calculates quantiles
along dimension dim. The dimth
dimension of Y has length length(P).
Quantiles are specified using cumulative probabilities from
0 to 1. For an n-element vector X,
quantile computes quantiles as follows:
The sorted values in X are
taken as the (0.5/n), (1.5/n),
..., ([n-0.5]/n) quantiles.
Linear interpolation is used to compute
quantiles for probabilities between (0.5/n) and
([n-0.5]/n).
The minimum or maximum values in X are
assigned to quantiles for probabilities outside that range.
quantile treats NaNs as
missing values and removes them.
Examples
y = quantile(x,.50); % the median of x
y = quantile(x,[.025 .25 .50 .75 .975]); % Summary of x
See Also
prctile, iqr, median
 | qqplot | | rand (qrandstream) |  |
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