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Statistics::Distributions 1.02

  Date Added: July 08, 2010  |  Visits: 1.281


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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: ; 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
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