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# brianary / Statistics-Lite Public

A trivial Perl statistics module.

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# NAME

Statistics::Lite - Small stats stuff.

# SYNOPSIS

``````    use Statistics::Lite qw(:all);

\$min= min @data;
\$mean= mean @data;

%data= statshash @data;
print "sum= \$data{sum} stddev= \$data{stddev}\n";

print statsinfo(@data);
``````

# DESCRIPTION

This module is a lightweight, functional alternative to larger, more complete, object-oriented statistics packages. As such, it is likely to be better suited, in general, to smaller data sets.

This is also a module for dilettantes.

When you just want something to give some very basic, high-school-level statistical values, without having to set up and populate an object first, this module may be useful.

## NOTE

This module implements standard deviation and variance calculated by both the unbiased and biased estimators.

# FUNCTIONS

• `min(@data)`, `max(@data)`, `range(@data)`, `sum(@data)`, `count(@data)`

Return the minimum value, maximum value, range (max - min), sum, or count of values in `@data`. (Count simply returns `scalar(@data)`. Please note that this module does not ignore undefined values in your data; instead those are treated as zero.)

• `mean(@data)`, `median(@data)`, `mode(@data)`

Calculates the mean, median, or mode average of the values in `@data`. (In the event of ties in the mode average, their mean is returned.)

• `variance(@data)`, `stddev(@data)`

Return the standard deviation or variance of `@data` for a sample (same as Excel's STDEV). This is also called the Unbiased Sample Variance and involves dividing the sample's squared deviations by N-1 (the sample count minus 1). The standard deviation is just the square root of the variance.

• `variancep(@data)`, `stddevp(@data)`

Return the standard deviation or variance of `@data` for the population (same as Excel's STDEVP). This involves dividing the squared deviations of the population by N (the population size). The standard deviation is just the square root of the variance.

• `statshash(@data)`

Returns a hash whose keys are the names of all the functions listed above, with the corresponding values, calculated for the data set.

• `statsinfo(@data)`

Returns a string describing the data set, using the values detailed above.

• `frequencies(@data)`

Returns a hash, the keys are the distinct values in the data set, and the values are the number of times that value occurred in the data set.

## Import Tags

The `:all` import tag imports all functions from this module into the current namespace (use with caution). To import the individual statistical funcitons, use the import tag `:funcs`; use `:stats` to import `statshash(@data)` and `statsinfo(@data)`.

# AUTHOR

Brian Lalonde brian@webcoder.info, `stddev(@data)`, `stddevp(@data)`, `variance(@data)`, `variancep(@data)`, and additional motivation by Nathan Haigh.

The project lives at https://github.com/brianary/Statistics-Lite

Copyright 2000 Brian Lalonde brian@webcoder.info and Nathan Haigh, with kind support from Alexander Zangerl.

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

perl(1).

A trivial Perl statistics module.

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