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Statistics::PointEstimation 1.1.0

  Date Added: November 08, 2010  |  Visits: 641

Statistics::PointEstimation

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Statistics::PointEstimation is a Perl module for computing confidence intervals in parameter estimation with Students T distribution. Statistics::PointEstimation::Sufficient - Perl module for computing the confidence intervals using sufficient statistics SYNOPSIS # example for Statistics::PointEstimation use Statistics::PointEstimation; my @r=(); for($i=1;$i<=32;$i++) #generate a uniformly distributed sample with mean=5 { $rand=rand(10); push @r,$rand; } my $stat = new Statistics::PointEstimation; $stat->set_significance(95); #set the significance(confidence) level to 95% $stat->add_data(@r); $stat->output_confidence_interval(); #output summary $stat->print_confidence_interval(); #output the data hash related to confidence interval estimation #the following is the same as $stat->output_confidence_interval(); print "Summary from the observed values of the sample:n"; print "tsample size= ", $stat->count()," , degree of freedom=", $stat->df(), "n"; print "tmean=", $stat->mean()," , variance=", $stat->variance(),"n"; print "tstandard deviation=", $stat->standard_deviation()," , standard error=", $stat->standard_error(),"n"; print "t the estimate of the mean is ", $stat->mean()," +/- ",$stat->delta(),"nt", " or (",$stat->lower_clm()," to ",$stat->upper_clm," ) with ",$stat->significance," % of confidencen"; print "t t-statistic=T=",$stat->t_statistic()," , Prob >|T|=",$stat->t_prob(),"n"; #example for Statistics::PointEstimation::Sufficient use strict; use Statistics::PointEstimation; my ($count,$mean,$variance)=(30,3.996,1.235); my $stat = new Statistics::PointEstimation::Sufficient; $stat->set_significance(99); $stat->load_data($count,$mean,$variance); $stat->output_confidence_interval(); $stat->set_significance(95); $stat->output_confidence_interval(); Statistics::PointEstimation This module is a subclass of Statistics::Descriptive::Full. It uses T-distribution for point estimation assuming the data is normally distributed or the sample size is sufficiently large. It overrides the add_data() method in Statistics::Descriptive to compute the confidence interval with the specified significance level (default is 95%). It also computes the t-statistic=T and Prob>|T| in case of hypothesis testing of paired T-tests. Statistics::PointEstimation::Sufficient This module is a subclass of Statistics::PointEstimation. Instead of taking the real data points as the input, it will compute the confidence intervals based on the sufficient statistics and the sample size inputted. To use this module, you need to pass the sample size, the sample mean , and the sample variance into the load_data() function. The output will be exactly the same as the Statistics::PointEstimation Module..

Requirements: No special requirements
Platforms: Linux
Keyword: Confidence Confidence Intervals Data Libraries Module Output Perl Module Pointestimation Print Programming Statisticspointestimation
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