The purpose of this (XS) module is to calculate the median (or in principle also other statistics) with confidence intervals on a sample. To do that, it uses a technique called bootstrapping. In a nutshell, it resamples the sample a lot of times and for each resample, it calculates the median. From the distribution of medians, it then calculates the confidence limits.
WWW: http://search.cpan.org/dist/Statistics-CaseResampling/
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