[PHP] PMCC Calculator

lee101 · 01-18-2007, 12:13 PM

Possibly one of the most useless functions, but i thought i'd post it anyway, as it may be of use to someone. It calculates PMCC between to set's of data, i created it because excel was continously throwing up errors with all the data I entered.

pmcc.class.php

PHP Code:

 
  <?php

/*

    PMCC (Product Moment Correlation Coefficient) Class

    Takes 2 sets of data, and calculates their relationship using the PMCC formula

    and returns a value between -1 and 1

    

 
 
    Created by: Lee Findlow

    Contact:     leefindlow@gmail.com

    Website:     http://conceptsublime.com

*/ 

class PMCC{

    //Variables Used, for range x and range y

    var $DataX;

    var $DataY;

 
    //Function to create Sxx

    function Sxx(){

    //Disable Error Reporting

    error_reporting(0);

        $NumOfAll = count($this->DataX);

        $SumOfAll = array_sum($this->DataX);

        $MeanOfAll = $SumOfAll/$NumOfAll;

        //Calculate Σ(Xi-[Mean Of All X's])^2

        $RunningTotal = 0;

            foreach($this->DataX as $Sxx){

????: NamePros.com http://www.namepros.com/code/282994-php-pmcc-calculator.html
                $RunningTotal += pow(($Sxx-$MeanOfAll),2);

            }

        return $RunningTotal;

    }

    

    //Function to create Syy

    function Syy(){

    //Disable Error Reporting

    error_reporting(0);

        $NumOfAll = count($this->DataY);

        $SumOfAll = array_sum($this->DataY);

        $MeanOfAll = $SumOfAll/$NumOfAll;

        //Calculate Σ(Yi-[Mean Of All Y's])^2

        $RunningTotal = 0;

            foreach($this->DataY as $Syy){

                $RunningTotal += pow(($Syy-$MeanOfAll),2);

            }

        return $RunningTotal;

    }

    

    //Function to create Sxy

    function Sxy(){

    //Disable Error Reporting

    error_reporting(0);

        $NumOfAll_X = count($this->DataX);

        $SumOfAll_X = array_sum($this->DataX);

        $MeanOfAll_X = $SumOfAll_X/$NumOfAll_X;

        $NumOfAll_Y = count($this->DataX);

        $SumOfAll_Y = array_sum($this->DataX);

        $MeanOfAll_Y = $SumOfAll_Y/$NumOfAll_Y;

        $NumOfAll = min($NumOfAll_X,$NumOfAll_Y);

        //Loop Through and create Σ(Xi-[Mean Of All X's])(Yi-[Mean Of All Y's])

        $i = 0;

        $RunningTotal = 0;

        while($i < $NumOfAll){

            $X = $this->DataX[$i] - $MeanOfAll_X;

            $Y = ($this->DataY[$i]-$MeanOfAll_Y);

            $RunningTotal+= $X * $Y;

            $i++;

        }

        return $RunningTotal;

    }

    

    //Combine All Functions to Create PMCC Value

    function PMCC(){

    //Disable Error Reporting

    error_reporting(0);

????: NamePros.com http://www.namepros.com/showthread.php?t=282994
        //Calculate Lower Part

        $SxxSyy = $this->Sxx()*$this->Syy();

        $SxxSyy = sqrt($SxxSyy);

        //Do Calculation

        $PMCC = $this->Sxy()/$SxxSyy;

        //Return Answer

        return $PMCC;

    }

};

?>

The data you want to compare is entered as an array, as displayed above

More Information - http://en.wikipedia.org/wiki/PMCC

Lee

01-18-2007, 12:13 PM	THREAD STARTER #1 (permalink)
lee101 NamePros Regular Join Date: Mar 2006 Location: United Kingdom Posts: 413 Follow @leefindlow	[PHP] PMCC Calculator Possibly one of the most useless functions, but i thought i'd post it anyway, as it may be of use to someone. It calculates PMCC between to set's of data, i created it because excel was continously throwing up errors with all the data I entered. pmcc.class.php PHP Code: <?php /* PMCC (Product Moment Correlation Coefficient) Class Takes 2 sets of data, and calculates their relationship using the PMCC formula and returns a value between -1 and 1 Created by: Lee Findlow Contact: leefindlow@gmail.com Website: http://conceptsublime.com / class PMCC{ //Variables Used, for range x and range y var $DataX; var $DataY; //Function to create Sxx function Sxx(){ //Disable Error Reporting error_reporting(0); $NumOfAll = count($this->DataX); $SumOfAll = array_sum($this->DataX); $MeanOfAll = $SumOfAll/$NumOfAll; //Calculate Σ(Xi-[Mean Of All X's])^2 $RunningTotal = 0; foreach($this->DataX as $Sxx){ ????: NamePros.com http://www.namepros.com/code/282994-php-pmcc-calculator.html $RunningTotal += pow(($Sxx-$MeanOfAll),2); } return $RunningTotal; } //Function to create Syy function Syy(){ //Disable Error Reporting error_reporting(0); $NumOfAll = count($this->DataY); $SumOfAll = array_sum($this->DataY); $MeanOfAll = $SumOfAll/$NumOfAll; //Calculate Σ(Yi-[Mean Of All Y's])^2 $RunningTotal = 0; foreach($this->DataY as $Syy){ $RunningTotal += pow(($Syy-$MeanOfAll),2); } return $RunningTotal; } //Function to create Sxy function Sxy(){ //Disable Error Reporting error_reporting(0); $NumOfAll_X = count($this->DataX); $SumOfAll_X = array_sum($this->DataX); $MeanOfAll_X = $SumOfAll_X/$NumOfAll_X; $NumOfAll_Y = count($this->DataX); $SumOfAll_Y = array_sum($this->DataX); $MeanOfAll_Y = $SumOfAll_Y/$NumOfAll_Y; $NumOfAll = min($NumOfAll_X,$NumOfAll_Y); //Loop Through and create Σ(Xi-[Mean Of All X's])(Yi-[Mean Of All Y's]) $i = 0; $RunningTotal = 0; while($i < $NumOfAll){ $X = $this->DataX[$i] - $MeanOfAll_X; $Y = ($this->DataY[$i]-$MeanOfAll_Y); $RunningTotal+= $X $Y; $i++; } return $RunningTotal; } //Combine All Functions to Create PMCC Value function PMCC(){ //Disable Error Reporting error_reporting(0); ????: NamePros.com http://www.namepros.com/showthread.php?t=282994 //Calculate Lower Part $SxxSyy = $this->Sxx()$this->Syy(); $SxxSyy = sqrt($SxxSyy); //Do Calculation $PMCC = $this->Sxy()/$SxxSyy; //Return Answer return $PMCC; } }; ?> The data you want to compare is entered as an array, as displayed above More Information - http://en.wikipedia.org/wiki/PMCC Lee __________________ Linux Screenshots Last edited by lee101; 01-21-2007 at 09:49 AM.*

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