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How to calculate 2-tailed P value using t value and degree of freedom?

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William
William 2015-2-4
评论： Star Strider 2015-2-4
Hi all, I have gotten the t value and degree of freedom of paired data in T-Test .I need to calculate the 2-tailed P value using t value and degree of freedom.I know that the function 'tcdf' can calculate 1-tailed P value.But I still don't know how to calculate 2-tailed P value. I will be very appreciate your answers. Thank you!

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Star Strider
Star Strider 2015-2-4
You can simply cut to the chase and calculate it directly:
tdist2T = @(t,v) (1-betainc(v/(v+t^2),v/2,0.5)); % 2-tailed t-distribution
where ‘t’ is the t-statistic and ‘v’ the degrees-of-freedom.
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