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# Statistics::Distributions 1.02

Date Added: July 08, 2010  |  Visits: 1.281

Statistics::Distributions is a Perl module for calculating critical values and upper probabilities of common statistical distributions. SYNOPSIS use Statistics::Distributions; \$chis=Statistics::Distributions::chisqrdistr (2,.05); print "Chi-squared-crit (2 degrees of freedom, 95th percentile " ."= 0.05 level) = \$chisn"; \$u=Statistics::Distributions::udistr (.05); print "u-crit (95th percentile = 0.05 level) = \$un"; \$t=Statistics::Distributions::tdistr (1,.005); print "t-crit (1 degree of freedom, 99.5th percentile = 0.005 level) " ."= \$tn"; \$f=Statistics::Distributions::fdistr (1,3,.01); print "F-crit (1 degree of freedom in numerator, 3 degrees of freedom " ."in denominator, 99th percentile = 0.01 level) = \$fn"; \$uprob=Statistics::Distributions::uprob (-0.85); print "upper probability of the u distribution (u = -0.85): Q(u) " ."= 1-G(u) = \$uprobn"; \$chisprob=Statistics::Distributions::chisqrprob (3,6.25); print "upper probability of the chi-square distribution (3 degrees " ."of freedom, chi-squared = 6.25): Q = 1-G = \$chisprobn"; \$tprob=Statistics::Distributions::tprob (3,6.251); print "upper probability of the t distribution (3 degrees of " ."freedom, t = 6.251): Q = 1-G = \$tprobn"; \$fprob=Statistics::Distributions::fprob (3,5,.625); print "upper probability of the F distribution (3 degrees of freedom " ."in numerator, 5 degrees of freedom in denominator, F = 6.25): " ."Q = 1-G = \$fprobn"; This Perl module calculates percentage points (5 significant digits) of the u (standard normal) distribution, the students 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: StatLib: http://lib.stat.cmu.edu/apstat/ ; Applied Statistics Algorithms by Griffiths, P. and Hill, I.D., Ellis Horwood: Chichester (1985).

 Requirements: No special requirements Platforms: Linux Keyword: Critical Values,  Degrees Of Freedom,  Distribution,  Freedom,  Libraries,  Perl Module,  Print,  Programming,  Statisticsdistributions,  Upper Users rating: 0/10