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Is it possible to calculate the tail probablitlies of the chi-square distribution in MATLAB 7.11 (R2010b)?

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Prabhakar 2011-1-18

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I want to compute 1-chi2cdf(x,d) and the tail probability of a chi-square PDF. The function CHI2CDF cancels its value when its value is close to 1. In many cases I would like to have this value as I desire to set a threshold that is less than eps, machine epsilon.

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Michael 2011-1-18

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You can get the upper tail probablities for the chi-square distribution uisng the code below:

chi2pval = @(x,nu) gammainc(x/2,v/2,'upper');

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