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<?php |
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/** |
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* JPGraph v4.0.3 |
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*/ |
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namespace Amenadiel\JpGraph\Util; |
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define('__LR_EPSILON', 1.0e-8); |
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/** |
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* @class LinearRegression |
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*/ |
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class LinearRegression |
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{ |
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private $ix = []; |
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private $iy = []; |
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private $ib = 0; |
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private $ia = 0; |
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private $icalculated = false; |
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public $iDet = 0; |
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public $iCorr = 0; |
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public $iStdErr = 0; |
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public function __construct($aDataX, $aDataY) |
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{ |
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if (safe_count($aDataX) !== safe_count($aDataY)) { |
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JpGraph::Raise('LinearRegression: X and Y data array must be of equal length.'); |
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} |
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$this->ix = $aDataX; |
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$this->iy = $aDataY; |
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} |
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public function Calc() |
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{ |
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$this->icalculated = true; |
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$n = safe_count($this->ix); |
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$sx2 = 0; |
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$sy2 = 0; |
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$sxy = 0; |
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$sx = 0; |
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$sy = 0; |
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for ($i = 0; $i < $n; ++$i) { |
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$sx2 += $this->ix[$i] * $this->ix[$i]; |
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$sy2 += $this->iy[$i] * $this->iy[$i]; |
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$sxy += $this->ix[$i] * $this->iy[$i]; |
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$sx += $this->ix[$i]; |
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$sy += $this->iy[$i]; |
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} |
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if ($n * $sx2 - $sx * $sx > __LR_EPSILON) { |
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$this->ib = ($n * $sxy - $sx * $sy) / ($n * $sx2 - $sx * $sx); |
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$this->ia = ($sy - $this->ib * $sx) / $n; |
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$sx = $this->ib * ($sxy - $sx * $sy / $n); |
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$sy2 = $sy2 - $sy * $sy / $n; |
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$sy = $sy2 - $sx; |
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$this->iDet = $sx / $sy2; |
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$this->iCorr = sqrt($this->iDet); |
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if ($n > 2) { |
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$this->iStdErr = sqrt($sy / ($n - 2)); |
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} else { |
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$this->iStdErr = NAN; |
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} |
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} else { |
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$this->ib = 0; |
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$this->ia = 0; |
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} |
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} |
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public function GetAB() |
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{ |
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if ($this->icalculated == false) { |
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$this->Calc(); |
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} |
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return [$this->ia, $this->ib]; |
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} |
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public function GetStat() |
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{ |
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if ($this->icalculated == false) { |
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$this->Calc(); |
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} |
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return [$this->iStdErr, $this->iCorr, $this->iDet]; |
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} |
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public function GetY($aMinX, $aMaxX, $aStep = 1) |
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{ |
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if ($this->icalculated == false) { |
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$this->Calc(); |
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} |
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$yy = []; |
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$i = 0; |
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for ($x = $aMinX; $x <= $aMaxX; $x += $aStep) { |
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$xx[$i] = $x; |
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$yy[$i++] = $this->ia + $this->ib * $x; |
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} |
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return [$xx, $yy]; |
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} |
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} |
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HuasoFoundries /
jpgraph
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When comparing two booleans, it is generally considered safer to use the strict comparison operator.