chi2cdf (Statistics Toolbox)

Chi-square (²) cumulative distribution function (cdf).

Syntax

P = chi2cdf(X,V)

Description

chi2cdf(X,V) computes the

² cdf with parameter V at the values in X. The arguments X and V must be the same size except that a scalar argument functions as a constant matrix of the same size as the other argument.

The degrees of freedom,V, must be a positive integer.

The

² cdf is:

The result, p, is the probability that a single observation from the

² distribution with degrees of freedom,

, will fall in the interval [0 x].

The

² density function with n degrees of freedom is the same as the gamma density function with parameters n/2 and 2.

Examples

probability = chi2cdf(5,1:5)

probability =

    0.9747    0.9179    0.8282    0.7127    0.5841

probability = chi2cdf(1:5,1:5)

probability =

    0.6827    0.6321    0.6084    0.5940    0.5841

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