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by Yasunori
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Difference::FTest()   A

↳ Parent: Difference

Complexity

Conditions 2
Paths 2

Size

Total Lines 12
Code Lines 7

Duplication

Lines 0
Ratio 0 %

Importance

Changes 1
Bugs 0 Features 0
Metric Value
cc 2
eloc 7
c 1
b 0
f 0
nc 2
nop 3
dl 0
loc 12
rs 10
1 
<?php
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namespace devfym\IntelliPHP\Math;

            


            
                                                                                                            
                            
            
                                    
            
            

                
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use devfym\IntelliPHP\Data\DataFrame;

            


            
                                                                                                            
                            
            
                                    
            
            

                
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class Difference

            


            
                                                                                                            
                            
            
                                    
            
            

                
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{

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    /**

            


            
                                                                                                            
                            
            
                                    
            
            

                
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     * @param $df

            


            
                                                                                                            
                            
            
                                    
            
            

                
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     * @param $xColumn

            


            
                                                                                                            
                            
            
                                    
            
            

                
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     * @param $yColumn

            


            
                                                                                                            
                            
            
                                    
            
            

                
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     * @return float

            


            
                                                                                                            
                                                                
            
                                    
            
            

                
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     */

            


            
                                                        
            
                                    
            
            

                
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    public static function FTest(DataFrame $df, $xColumn, $yColumn) : float

            


            
                                                        
            
                                    
            
            

                
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    {

            


            
                                                        
            
                                    
            
            

                
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        $xVariance = $df->{$xColumn}->variance();

            


            
                                                        
            
                                    
            
            

                
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        $yVariance = $df->{$yColumn}->variance();

            


            
                                                        
            
                                    
            
            

                
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        if ($xVariance < $yVariance) {

            


            
                                                        
            
                                    
            
            

                
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            $f = $xVariance / $yVariance;

            


            
                                                        
            
                                    
            
            

                
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        } else {

            


            
                                                        
            
                                    
            
            

                
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            $f = $yVariance / $xVariance;

            


            
                                                        
            
                                    
            
            

                
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        }

            


            
                                                        
            
                                    
            
            

                
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        return round($f, 4);

            


            
                                                        
            
                                    
            
            

                
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    }

            


            
                                                        
            
                                    
            
            

                
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}