libstatistics-distributions-perl - 1.02-1.1 main

Statistics::Distributions calculates percentage points (5 significant digits)
of the u (standard normal) distribution, the student's t distribution, the
chi-square distribution and the F distribution. It can also calculate the upper
probability (5 significant digits) of the u (standard normal), the
chi-square, the t and the F distribution. These critical values are needed to
perform statistical tests, like the u test, the t test, the F test and the
chi-squared test, and to calculate confidence intervals.
.
If you are interested in more precise algorithms you could look at:
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StatLib: http://lib.stat.cmu.edu/apstat/ ;
.
Applied Statistics Algorithms by Griffiths, P. and Hill, I.D., Ellis Horwood:
Chichester (1985)