Category Archives: Math

Testing the statistics functions

Posted on Thursday 14 July 2011 by richardsiddaway

To enable repeatable testing of the statistical functions I’m creating I decided to create a test script. $data1 = @(1,2,3,4,5,6,7,8,9,10) $data2 = @(21,22,23,24,25,26,27,28,29,30) get-mean -numbers $data1 get-mean -numbers $data2 get-standarddeviation -numbers $data1 get-standarddeviation -numbers $data2 get-correlation -numbers1 $data1 -numbers2 $data2 … Continue reading →

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Calculating the correlation coefficient

Posted on Thursday 14 July 2011 by richardsiddaway

This measures the degree of dependence between two sets of values – +1 indicates perfect positive correlation 0 indicates no correlation -1 indicates perfect negative correlation We can calculate the correlation coefficient using this function function get-correlation { [CmdletBinding()] param … Continue reading →

Posted in Math, PowerShell V2 | Leave a comment

Standard Deviation

Posted on Tuesday 12 July 2011 by richardsiddaway

Another simple calculation in PowerShell function get-standarddeviation { [CmdletBinding()] param ( [double[]]$numbers ) $avg = $numbers | Measure-Object -Average | select Count, Average $popdev = 0 foreach ($number in $numbers){ $popdev += [math]::pow(($number – $avg.Average), 2) } $sd = [math]::sqrt($popdev … Continue reading →

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Mean and moody

Posted on Tuesday 12 July 2011 by richardsiddaway

Been looking at some simple statistical calculations.  First off calculating the mean (arithmetic mean aka average in layman’s speak) For this we can use Measure-Object   function get-mean { [CmdletBinding()] param ( [double[]]$numbers ) $result = $numbers | Measure-Object -Average … Continue reading →

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