---
name: "Statistics::Lite"
section: "3pm"
platform: "linux"
package: "libstatistics-lite-perl"
version: "3.62-1.1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/Statistics::Lite"
---

# Statistics::Lite(3pm)

Small stats stuff.

## 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)"

  Returns the minimum value, maximum value, range (max - min), sum, or count of values in `@data`. Undefined values are ignored.

  `"count(@data)"` 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`. Undefined values are ignored. (In the event of ties in the mode average, their mean is returned.)

- "variance(@data)", "stddev(@data)"

  Returns 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)"

  Returns 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 exportable functions from this module into the current namespace (use with caution). More specifically, these functions are the following: `"min"`, `"max"`, `"range"`, `"sum"`, `"count"`, `"mean"`, `"median"`, `"mode"`, `"variance"`, `"stddev"`, `"variancep"`, `"stddevp"`, `"statshash"`, `"statsinfo"`, and `"frequencies"`.

To import the statistical functions, use the import tag `":funcs"`.  This imports all of the above-mentioned functions, except for `"statshash"`, `"statsinfo"`, and `"frequencies"`.

Use `":stats"` to import `"statshash(@data)"` and `"statsinfo(@data)"`.

## REPOSITORY

\<https://github.com/brianary/Statistics-Lite\>

## AUTHOR

Brian Lalonde \<brian@webcoder.info\>, `"stddev(@data)"`, `"stddevp(@data)"`, `"variance(@data)"`, `"variancep(@data)"`, additional motivation by Nathan Haigh, with kind support from Alexander Zangerl.

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

## COPYRIGHT AND LICENSE

Copyright 2000 Brian Lalonde \<brian@webcoder.info\>, Nathan Haigh, Alexander Zangerl, and Ton Voon.

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

## SEE ALSO

[**perl**(1)](/perl/1.md).