MATLAB: Obtaining the P values for the t stat

MATLAB

I have both the tstat and the degrees of freedom, is there a quick way to find the P value of a two tailed hypothesis at a significance of 0.05

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p = 1-tcdf(t,n-1) % Probability of larger t-statistic

requires Statistics Toolbox...

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MATLAB: Obtaining the p value from the t stat

If you have the Statistics Toolbox, the tcdf function will do what you want.

If not, the t-probability calculation is a one-line anonymous function:

tdist2T = @(t,v) (1-betainc(v/(v+t^2),v/2,0.5));    % 2-tailed t-distribution
tdist1T = @(t,v) 1-(1-tdist2T(t,v))/2;              % 1-tailed t-distribution

where ‘t’ is the t-statistic and ‘v’ are the degrees-of-freedom. (Note that ‘tdist1T’ calls ‘tdist2T’.)

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MATLAB: Obtaining the p value from the t stat

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