https://github.com/brianary/statistics-lite

A trivial Perl statistics module.
https://github.com/brianary/statistics-lite

perl-module perl5

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A trivial Perl statistics module.

• Host: GitHub
• URL: https://github.com/brianary/statistics-lite
• Owner: brianary
• Created: 2015-02-16T16:47:09.000Z (over 9 years ago)
• Default Branch: main
• Last Pushed: 2021-09-06T03:53:15.000Z (about 3 years ago)
• Last Synced: 2024-09-24T23:33:52.987Z (2 days ago)
• Topics: perl-module, perl5
• Language: Perl
• Homepage: https://metacpan.org/pod/Statistics::Lite
• Size: 11.7 KB
• Stars: 4
• Watchers: 3
• Forks: 1
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • Changelog: Changes

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README

        
# 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 , 

`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 AND LICENSE

Copyright 2000 Brian Lalonde  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.

# SEE ALSO

perl(1).