Start splitting some of the basic Statistical functions out into separate classes

src/PhpSpreadsheet/Calculation/Calculation.php

@@ -328,17 +328,17 @@ class Calculation
         ],
         'AVEDEV' => [
             'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical::class, 'AVEDEV'],
+            'functionCall' => [Statistical\Averages::class, 'AVEDEV'],
             'argumentCount' => '1+',
         ],
         'AVERAGE' => [
             'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical::class, 'AVERAGE'],
+            'functionCall' => [Statistical\Averages::class, 'AVERAGE'],
             'argumentCount' => '1+',
         ],
         'AVERAGEA' => [
             'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical::class, 'AVERAGEA'],
+            'functionCall' => [Statistical\Averages::class, 'AVERAGEA'],
             'argumentCount' => '1+',
         ],
         'AVERAGEIF' => [
@@ -624,17 +624,17 @@ class Calculation
         ],
         'COUNT' => [
             'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical::class, 'COUNT'],
+            'functionCall' => [Statistical\Counts::class, 'COUNT'],
             'argumentCount' => '1+',
         ],
         'COUNTA' => [
             'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical::class, 'COUNTA'],
+            'functionCall' => [Statistical\Counts::class, 'COUNTA'],
             'argumentCount' => '1+',
         ],
         'COUNTBLANK' => [
             'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical::class, 'COUNTBLANK'],
+            'functionCall' => [Statistical\Counts::class, 'COUNTBLANK'],
             'argumentCount' => '1',
         ],
         'COUNTIF' => [
@@ -1620,12 +1620,12 @@ class Calculation
         ],
         'MAX' => [
             'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical::class, 'MAX'],
+            'functionCall' => [Statistical\Maximum::class, 'MAX'],
             'argumentCount' => '1+',
         ],
         'MAXA' => [
             'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical::class, 'MAXA'],
+            'functionCall' => [Statistical\Maximum::class, 'MAXA'],
             'argumentCount' => '1+',
         ],
         'MAXIFS' => [
@@ -1665,12 +1665,12 @@ class Calculation
         ],
         'MIN' => [
             'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical::class, 'MIN'],
+            'functionCall' => [Statistical\Minimum::class, 'MIN'],
             'argumentCount' => '1+',
         ],
         'MINA' => [
             'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical::class, 'MINA'],
+            'functionCall' => [Statistical\Minimum::class, 'MINA'],
             'argumentCount' => '1+',
         ],
         'MINIFS' => [
@@ -2263,22 +2263,22 @@ class Calculation
         ],
         'STDEV' => [
             'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical::class, 'STDEV'],
+            'functionCall' => [Statistical\StandardDeviations::class, 'STDEV'],
             'argumentCount' => '1+',
         ],
         'STDEV.S' => [
             'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical::class, 'STDEV'],
+            'functionCall' => [Statistical\StandardDeviations::class, 'STDEV'],
             'argumentCount' => '1+',
         ],
         'STDEV.P' => [
             'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical::class, 'STDEVP'],
+            'functionCall' => [Statistical\StandardDeviations::class, 'STDEVP'],
             'argumentCount' => '1+',
         ],
         'STDEVA' => [
             'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical::class, 'STDEVA'],
+            'functionCall' => [Statistical\StandardDeviations::class, 'STDEVA'],
             'argumentCount' => '1+',
         ],
         'STDEVP' => [
@@ -2524,32 +2524,32 @@ class Calculation
         ],
         'VAR' => [
             'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical::class, 'VARFunc'],
+            'functionCall' => [Statistical\Variances::class, 'VAR'],
             'argumentCount' => '1+',
         ],
         'VAR.P' => [
             'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical::class, 'VARP'],
+            'functionCall' => [Statistical\Variances::class, 'VARP'],
             'argumentCount' => '1+',
         ],
         'VAR.S' => [
             'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical::class, 'VARFunc'],
+            'functionCall' => [Statistical\Variances::class, 'VAR'],
             'argumentCount' => '1+',
         ],
         'VARA' => [
             'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical::class, 'VARA'],
+            'functionCall' => [Statistical\Variances::class, 'VARA'],
             'argumentCount' => '1+',
         ],
         'VARP' => [
             'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical::class, 'VARP'],
+            'functionCall' => [Statistical\Variances::class, 'VARP'],
             'argumentCount' => '1+',
         ],
         'VARPA' => [
             'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical::class, 'VARPA'],
+            'functionCall' => [Statistical\Variances::class, 'VARPA'],
             'argumentCount' => '1+',
         ],
         'VDB' => [

src/PhpSpreadsheet/Calculation/Database/DAverage.php

@@ -2,7 +2,7 @@
 
 namespace PhpOffice\PhpSpreadsheet\Calculation\Database;
 
-use PhpOffice\PhpSpreadsheet\Calculation\Statistical;
+use PhpOffice\PhpSpreadsheet\Calculation\Statistical\Averages;
 
 class DAverage extends DatabaseAbstract
 {
@@ -38,7 +38,7 @@ public static function evaluate($database, $field, $criteria)
             return null;
         }
 
-        return Statistical::AVERAGE(
+        return Averages::AVERAGE(
             self::getFilteredColumn($database, $field, $criteria)
         );
     }

src/PhpSpreadsheet/Calculation/Database/DCount.php

@@ -2,7 +2,7 @@
 
 namespace PhpOffice\PhpSpreadsheet\Calculation\Database;
 
-use PhpOffice\PhpSpreadsheet\Calculation\Statistical;
+use PhpOffice\PhpSpreadsheet\Calculation\Statistical\Counts;
 
 class DCount extends DatabaseAbstract
 {
@@ -36,7 +36,7 @@ public static function evaluate($database, $field, $criteria)
     {
         $field = self::fieldExtract($database, $field);
 
-        return Statistical::COUNT(
+        return Counts::COUNT(
             self::getFilteredColumn($database, $field, $criteria)
         );
     }

src/PhpSpreadsheet/Calculation/Database/DCountA.php

@@ -2,7 +2,7 @@
 
 namespace PhpOffice\PhpSpreadsheet\Calculation\Database;
 
-use PhpOffice\PhpSpreadsheet\Calculation\Statistical;
+use PhpOffice\PhpSpreadsheet\Calculation\Statistical\Counts;
 
 class DCountA extends DatabaseAbstract
 {
@@ -35,7 +35,7 @@ public static function evaluate($database, $field, $criteria)
     {
         $field = self::fieldExtract($database, $field);
 
-        return Statistical::COUNTA(
+        return Counts::COUNTA(
             self::getFilteredColumn($database, $field ?? 0, $criteria)
         );
     }

src/PhpSpreadsheet/Calculation/Database/DMax.php

@@ -2,7 +2,7 @@
 
 namespace PhpOffice\PhpSpreadsheet\Calculation\Database;
 
-use PhpOffice\PhpSpreadsheet\Calculation\Statistical;
+use PhpOffice\PhpSpreadsheet\Calculation\Statistical\Maximum;
 
 class DMax extends DatabaseAbstract
 {
@@ -39,7 +39,7 @@ public static function evaluate($database, $field, $criteria)
             return null;
         }
 
-        return Statistical::MAX(
+        return Maximum::MAX(
             self::getFilteredColumn($database, $field, $criteria)
         );
     }

src/PhpSpreadsheet/Calculation/Database/DMin.php

@@ -2,7 +2,7 @@
 
 namespace PhpOffice\PhpSpreadsheet\Calculation\Database;
 
-use PhpOffice\PhpSpreadsheet\Calculation\Statistical;
+use PhpOffice\PhpSpreadsheet\Calculation\Statistical\Minimum;
 
 class DMin extends DatabaseAbstract
 {
@@ -39,7 +39,7 @@ public static function evaluate($database, $field, $criteria)
             return null;
         }
 
-        return Statistical::MIN(
+        return Minimum::MIN(
             self::getFilteredColumn($database, $field, $criteria)
         );
     }

src/PhpSpreadsheet/Calculation/Database/DStDev.php

@@ -2,7 +2,7 @@
 
 namespace PhpOffice\PhpSpreadsheet\Calculation\Database;
 
-use PhpOffice\PhpSpreadsheet\Calculation\Statistical;
+use PhpOffice\PhpSpreadsheet\Calculation\Statistical\StandardDeviations;
 
 class DStDev extends DatabaseAbstract
 {
@@ -39,7 +39,7 @@ public static function evaluate($database, $field, $criteria)
             return null;
         }
 
-        return Statistical::STDEV(
+        return StandardDeviations::STDEV(
             self::getFilteredColumn($database, $field, $criteria)
         );
     }

src/PhpSpreadsheet/Calculation/Database/DStDevP.php

@@ -2,7 +2,7 @@
 
 namespace PhpOffice\PhpSpreadsheet\Calculation\Database;
 
-use PhpOffice\PhpSpreadsheet\Calculation\Statistical;
+use PhpOffice\PhpSpreadsheet\Calculation\Statistical\StandardDeviations;
 
 class DStDevP extends DatabaseAbstract
 {
@@ -39,7 +39,7 @@ public static function evaluate($database, $field, $criteria)
             return null;
         }
 
-        return Statistical::STDEVP(
+        return StandardDeviations::STDEVP(
             self::getFilteredColumn($database, $field, $criteria)
         );
     }

src/PhpSpreadsheet/Calculation/Database/DVar.php

@@ -2,7 +2,7 @@
 
 namespace PhpOffice\PhpSpreadsheet\Calculation\Database;
 
-use PhpOffice\PhpSpreadsheet\Calculation\Statistical;
+use PhpOffice\PhpSpreadsheet\Calculation\Statistical\Variances;
 
 class DVar extends DatabaseAbstract
 {
@@ -39,7 +39,7 @@ public static function evaluate($database, $field, $criteria)
             return null;
         }
 
-        return Statistical::VARFunc(
+        return Variances::VAR(
             self::getFilteredColumn($database, $field, $criteria)
         );
     }

src/PhpSpreadsheet/Calculation/Database/DVarP.php

@@ -2,7 +2,7 @@
 
 namespace PhpOffice\PhpSpreadsheet\Calculation\Database;
 
-use PhpOffice\PhpSpreadsheet\Calculation\Statistical;
+use PhpOffice\PhpSpreadsheet\Calculation\Statistical\Variances;
 
 class DVarP extends DatabaseAbstract
 {
@@ -39,7 +39,7 @@ public static function evaluate($database, $field, $criteria)
             return null;
         }
 
-        return Statistical::VARP(
+        return Variances::VARP(
             self::getFilteredColumn($database, $field, $criteria)
         );
     }

src/PhpSpreadsheet/Calculation/MathTrig.php

@@ -1222,27 +1222,27 @@ public static function SUBTOTAL($functionType, ...$args)
             $aArgs = self::filterFormulaArgs($cellReference, $aArgs);
             switch ($subtotal) {
                 case 1:
-                    return Statistical::AVERAGE($aArgs);
+                    return Statistical\Averages::AVERAGE($aArgs);
                 case 2:
-                    return Statistical::COUNT($aArgs);
+                    return Statistical\Counts::COUNT($aArgs);
                 case 3:
-                    return Statistical::COUNTA($aArgs);
+                    return Statistical\Counts::COUNTA($aArgs);
                 case 4:
-                    return Statistical::MAX($aArgs);
+                    return Statistical\Maximum::MAX($aArgs);
                 case 5:
-                    return Statistical::MIN($aArgs);
+                    return Statistical\Minimum::MIN($aArgs);
                 case 6:
                     return self::PRODUCT($aArgs);
                 case 7:
-                    return Statistical::STDEV($aArgs);
+                    return Statistical\StandardDeviations::STDEV($aArgs);
                 case 8:
-                    return Statistical::STDEVP($aArgs);
+                    return Statistical\StandardDeviations::STDEVP($aArgs);
                 case 9:
                     return self::SUM($aArgs);
                 case 10:
-                    return Statistical::VARFunc($aArgs);
+                    return Statistical\Variances::VAR($aArgs);
                 case 11:
-                    return Statistical::VARP($aArgs);
+                    return Statistical\Variances::VARP($aArgs);
             }
         }