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<?php
$myarray = array(2, 4, 4, 8, 10, 12, 20, 25, 28, 12); //X-array
$otherarray=array(3, 4, 5, 6, 8, 10, 12, 14, 16, 9); //Y-array
$sumX=0;
$sumY=0;
$sumXX=0;
$sumXY=0;
$n=10; //number of items
for ($i=0; $i<$n; $i++) {
$sumX +=$myarray[$i];
$sumY +=$otherarray[$i];
$meanX = $sumX/$n;
$meanY = $sumY/$n;
$sumXX += pow($myarray[$i],2);
$sumXY += ($myarray[$i])*($otherarray[$i]);
$m =($sumXY - $meanY*$sumX)/($sumXX-$meanX*$sumX);
$b =$meanY-$meanX*$m;
}
echo ("Sum of X : " .$sumX);
echo "<br>";
echo ("Sum of Y : " .$sumY);
echo "<br>";
echo ("Mean of X: " .$meanX);
echo "<br>";
echo ("Mean of Y: " .$meanY);
echo "<br>";
echo ("Sums of Squares for X: " .$sumXX);
echo "<br>";
echo ("A_hat : " .$m); //Estimation of line passing through two points
echo "<br>";
echo ("B_hat : " .$b);
echo "<br>";
echo ("The equation of the regression line is : y = " . $m );
echo ("x + " . $b);
?> |
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