Functions/Get-OverlapCoefficient.ps1
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function Get-OverlapCoefficient { <# .SYNOPSIS Get the Overlap Coefficient of two strings. .DESCRIPTION The overlap coefficient is a similarity measure related to the Jaccard index that measures the overlap between two sets, and is defined as the size of the intersection divided by the smaller of the size of the two sets. .EXAMPLE Get-OverlapCoefficient 'Pennsylvania' 'Pencilvaneya' .LINK http://en.wikipedia.org/wiki/Overlap_coefficient https://communary.wordpress.com/ https://github.com/gravejester/Communary.PASM .NOTES Author: Øyvind Kallstad Date: 03.11.2014 Version: 1.0 Dependencies: Get-Intersection #> [CmdletBinding()] param ( [Parameter(Position = 0)] [ValidateNotNullorEmpty()] [string] $String1, [Parameter(Position = 1)] [ValidateNotNullorEmpty()] [string] $String2, [Parameter()] [switch] $CaseSensitive ) if (-not($CaseSensitive)) { $String1 = $String1.ToLowerInvariant() $String2 = $String2.ToLowerInvariant() } try { $intersectionSize = (Get-Intersection $String1 $String2 -CaseSensitive:$CaseSensitive).Length $smallestStringSize = [Math]::Min($String1.Length,$String2.Length) Write-Output ($intersectionSize / $smallestStringSize) } catch { Write-Warning $_.Exception.Message } } |