diff --git a/src/PhpSpreadsheet/Calculation/Database.php b/src/PhpSpreadsheet/Calculation/Database.php
index 96599088..2ba4af2d 100644
--- a/src/PhpSpreadsheet/Calculation/Database.php
+++ b/src/PhpSpreadsheet/Calculation/Database.php
@@ -552,7 +552,7 @@ class Database
      *                                        the column label in which you specify a condition for the
      *                                        column.
      *
-     * @return float
+     * @return float|string (string if result is an error)
      */
     public static function DVAR($database, $field, $criteria)
     {
@@ -591,7 +591,7 @@ class Database
      *                                        the column label in which you specify a condition for the
      *                                        column.
      *
-     * @return float
+     * @return float|string (string if result is an error)
      */
     public static function DVARP($database, $field, $criteria)
     {
diff --git a/src/PhpSpreadsheet/Calculation/LookupRef.php b/src/PhpSpreadsheet/Calculation/LookupRef.php
index 0636258b..45aa9239 100644
--- a/src/PhpSpreadsheet/Calculation/LookupRef.php
+++ b/src/PhpSpreadsheet/Calculation/LookupRef.php
@@ -126,7 +126,7 @@ class LookupRef
      *
      * @param null|array|string $cellAddress An array or array formula, or a reference to a range of cells for which you want the number of columns
      *
-     * @return int The number of columns in cellAddress
+     * @return int|string The number of columns in cellAddress, or a string if arguments are invalid
      */
     public static function COLUMNS($cellAddress = null)
     {
@@ -160,7 +160,7 @@ class LookupRef
      *
      * @param null|array|string $cellAddress A reference to a range of cells for which you want the row numbers
      *
-     * @return int or array of integer
+     * @return int|mixed[]|string
      */
     public static function ROW($cellAddress = null)
     {
@@ -203,7 +203,7 @@ class LookupRef
      *
      * @param null|array|string $cellAddress An array or array formula, or a reference to a range of cells for which you want the number of rows
      *
-     * @return int The number of rows in cellAddress
+     * @return int|string The number of rows in cellAddress, or a string if arguments are invalid
      */
     public static function ROWS($cellAddress = null)
     {
diff --git a/src/PhpSpreadsheet/Calculation/MathTrig.php b/src/PhpSpreadsheet/Calculation/MathTrig.php
index fa4c74d3..7539659e 100644
--- a/src/PhpSpreadsheet/Calculation/MathTrig.php
+++ b/src/PhpSpreadsheet/Calculation/MathTrig.php
@@ -871,7 +871,7 @@ class MathTrig
      *
      * Returns the ratio of the factorial of a sum of values to the product of factorials.
      *
-     * @param array of mixed Data Series
+     * @param mixed[] $args An array of mixed values for the Data Series
      *
      * @return float|string The result, or a string containing an error
      */
@@ -1149,7 +1149,7 @@ class MathTrig
      *
      * Returns the sum of a power series
      *
-     * @param array of mixed Data Series
+     * @param mixed[] $args An array of mixed values for the Data Series
      *
      * @return float|string The result, or a string containing an error
      */
@@ -1273,21 +1273,22 @@ class MathTrig
      *
      * Returns a subtotal in a list or database.
      *
-     * @param int the number 1 to 11 that specifies which function to
+     * @param int $functionType
+     *            A number 1 to 11 that specifies which function to
      *                    use in calculating subtotals within a range
      *                    list
      *            Numbers 101 to 111 shadow the functions of 1 to 11
      *                    but ignore any values in the range that are
      *                    in hidden rows or columns
-     * @param array of mixed Data Series
+     * @param mixed[] $args A mixed data series of values
      *
      * @return float|string
      */
-    public static function SUBTOTAL(...$args)
+    public static function SUBTOTAL($functionType, ...$args)
     {
         $cellReference = array_pop($args);
         $aArgs = Functions::flattenArrayIndexed($args);
-        $subtotal = array_shift($aArgs);
+        $subtotal = Functions::flattenSingleValue($functionType);
 
         // Calculate
         if ((is_numeric($subtotal)) && (!is_string($subtotal))) {
diff --git a/src/PhpSpreadsheet/Calculation/Statistical.php b/src/PhpSpreadsheet/Calculation/Statistical.php
index 4b113726..19f40f2d 100644
--- a/src/PhpSpreadsheet/Calculation/Statistical.php
+++ b/src/PhpSpreadsheet/Calculation/Statistical.php
@@ -1445,7 +1445,7 @@ class Statistical
             return $returnValue;
         }
 
-        return self::NA();
+        return Functions::NA();
     }
 
     /**
@@ -1701,7 +1701,6 @@ class Statistical
             $xHi = $alpha * $beta * 5;
 
             $x = $xNew = 1;
-            $error = $pdf = 0;
             $dx = 1024;
             $i = 0;
 
@@ -2019,11 +2018,12 @@ class Statistical
     public static function LARGE(...$args)
     {
         $aArgs = Functions::flattenArray($args);
-
-        // Calculate
-        $entry = floor(array_pop($aArgs));
+        $entry = array_pop($aArgs);
 
         if ((is_numeric($entry)) && (!is_string($entry))) {
+            $entry = (int) floor($entry);
+
+            // Calculate
             $mArgs = [];
             foreach ($aArgs as $arg) {
                 // Is it a numeric value?
@@ -2032,7 +2032,7 @@ class Statistical
                 }
             }
             $count = self::COUNT($mArgs);
-            $entry = floor(--$entry);
+            --$entry;
             if (($entry < 0) || ($entry >= $count) || ($count == 0)) {
                 return Functions::NAN();
             }
@@ -2873,7 +2873,7 @@ class Statistical
      * @param int $value the number whose rank you want to find
      * @param int $significance the number of significant digits for the returned percentage value
      *
-     * @return float
+     * @return float|string (string if result is an error)
      */
     public static function PERCENTRANK($valueSet, $value, $significance = 3)
     {
@@ -3169,6 +3169,8 @@ class Statistical
         $entry = array_pop($aArgs);
 
         if ((is_numeric($entry)) && (!is_string($entry))) {
+            $entry = (int) floor($entry);
+
             $mArgs = [];
             foreach ($aArgs as $arg) {
                 // Is it a numeric value?
@@ -3177,7 +3179,7 @@ class Statistical
                 }
             }
             $count = self::COUNT($mArgs);
-            $entry = floor(--$entry);
+            --$entry;
             if (($entry < 0) || ($entry >= $count) || ($count == 0)) {
                 return Functions::NAN();
             }
@@ -3481,7 +3483,6 @@ class Statistical
             $ttheta = atan2($value, sqrt($tterm));
             $tc = cos($ttheta);
             $ts = sin($ttheta);
-            $tsum = 0;
 
             if (($degrees % 2) == 1) {
                 $ti = 3;
@@ -3657,7 +3658,7 @@ class Statistical
      *
      * @param mixed ...$args Data values
      *
-     * @return float
+     * @return float|string (string if result is an error)
      */
     public static function VARFunc(...$args)
     {
@@ -3699,7 +3700,7 @@ class Statistical
      *
      * @param mixed ...$args Data values
      *
-     * @return float
+     * @return float|string (string if result is an error)
      */
     public static function VARA(...$args)
     {
@@ -3754,7 +3755,7 @@ class Statistical
      *
      * @param mixed ...$args Data values
      *
-     * @return float
+     * @return float|string (string if result is an error)
      */
     public static function VARP(...$args)
     {
@@ -3797,7 +3798,7 @@ class Statistical
      *
      * @param mixed ...$args Data values
      *
-     * @return float
+     * @return float|string (string if result is an error)
      */
     public static function VARPA(...$args)
     {
@@ -3853,7 +3854,7 @@ class Statistical
      * @param float $beta Beta Parameter
      * @param bool $cumulative
      *
-     * @return float
+     * @return float|string (string if result is an error)
      */
     public static function WEIBULL($value, $alpha, $beta, $cumulative)
     {
@@ -3887,7 +3888,7 @@ class Statistical
      * @param float $m0 Alpha Parameter
      * @param float $sigma Beta Parameter
      *
-     * @return float|string
+     * @return float|string (string if result is an error)
      */
     public static function ZTEST($dataSet, $m0, $sigma = null)
     {
diff --git a/src/PhpSpreadsheet/Calculation/TextData.php b/src/PhpSpreadsheet/Calculation/TextData.php
index 8f4b7d87..da958836 100644
--- a/src/PhpSpreadsheet/Calculation/TextData.php
+++ b/src/PhpSpreadsheet/Calculation/TextData.php
@@ -2,6 +2,7 @@
 
 namespace PhpOffice\PhpSpreadsheet\Calculation;
 
+use DateTimeInterface;
 use PhpOffice\PhpSpreadsheet\Shared\Date;
 use PhpOffice\PhpSpreadsheet\Shared\StringHelper;
 use PhpOffice\PhpSpreadsheet\Style\NumberFormat;
@@ -98,7 +99,7 @@ class TextData
      *
      * @param string $characters Value
      *
-     * @return int
+     * @return int|string A string if arguments are invalid
      */
     public static function ASCIICODE($characters)
     {
@@ -543,7 +544,7 @@ class TextData
      *
      * @param mixed $value Value to check
      *
-     * @return bool
+     * @return DateTimeInterface|float|int|string A string if arguments are invalid
      */
     public static function VALUE($value = '')
     {
diff --git a/tests/PhpSpreadsheetTests/Calculation/Functions/Statistical/LargeTest.php b/tests/PhpSpreadsheetTests/Calculation/Functions/Statistical/LargeTest.php
new file mode 100644
index 00000000..194248d0
--- /dev/null
+++ b/tests/PhpSpreadsheetTests/Calculation/Functions/Statistical/LargeTest.php
@@ -0,0 +1,27 @@
+<?php
+
+namespace PhpOffice\PhpSpreadsheetTests\Calculation\Functions\Statistical;
+
+use PhpOffice\PhpSpreadsheet\Calculation\Statistical;
+use PHPUnit\Framework\TestCase;
+
+class LargeTest extends TestCase
+{
+    /**
+     * @dataProvider providerLARGE
+     *
+     * @param mixed $expectedResult
+     * @param mixed $values
+     * @param mixed $position
+     */
+    public function testLARGE($expectedResult, $values, $position): void
+    {
+        $result = Statistical::LARGE($values, $position);
+        self::assertEqualsWithDelta($expectedResult, $result, 1E-12);
+    }
+
+    public function providerLARGE()
+    {
+        return require 'tests/data/Calculation/Statistical/LARGE.php';
+    }
+}
diff --git a/tests/PhpSpreadsheetTests/Calculation/Functions/Statistical/LinEstTest.php b/tests/PhpSpreadsheetTests/Calculation/Functions/Statistical/LinEstTest.php
new file mode 100644
index 00000000..083ac899
--- /dev/null
+++ b/tests/PhpSpreadsheetTests/Calculation/Functions/Statistical/LinEstTest.php
@@ -0,0 +1,33 @@
+<?php
+
+namespace PhpOffice\PhpSpreadsheetTests\Calculation\Functions\Statistical;
+
+use PhpOffice\PhpSpreadsheet\Calculation\Statistical;
+use PHPUnit\Framework\TestCase;
+
+class LinEstTest extends TestCase
+{
+    /**
+     * @dataProvider providerLINEST
+     *
+     * @param mixed $expectedResult
+     * @param mixed $xValues
+     * @param mixed $yValues
+     * @param mixed $const
+     * @param mixed $stats
+     */
+    public function testLINEST($expectedResult, $yValues, $xValues, $const, $stats): void
+    {
+        $result = Statistical::LINEST($yValues, $xValues, $const, $stats);
+
+        $elements = count($expectedResult);
+        for ($element = 0; $element < $elements; ++$element) {
+            self::assertEqualsWithDelta($expectedResult[$element], $result[$element], 1E-12);
+        }
+    }
+
+    public function providerLINEST()
+    {
+        return require 'tests/data/Calculation/Statistical/LINEST.php';
+    }
+}
diff --git a/tests/PhpSpreadsheetTests/Calculation/Functions/Statistical/LogEstTest.php b/tests/PhpSpreadsheetTests/Calculation/Functions/Statistical/LogEstTest.php
new file mode 100644
index 00000000..4d926f76
--- /dev/null
+++ b/tests/PhpSpreadsheetTests/Calculation/Functions/Statistical/LogEstTest.php
@@ -0,0 +1,33 @@
+<?php
+
+namespace PhpOffice\PhpSpreadsheetTests\Calculation\Functions\Statistical;
+
+use PhpOffice\PhpSpreadsheet\Calculation\Statistical;
+use PHPUnit\Framework\TestCase;
+
+class LogEstTest extends TestCase
+{
+    /**
+     * @dataProvider providerLOGEST
+     *
+     * @param mixed $expectedResult
+     * @param mixed $xValues
+     * @param mixed $yValues
+     * @param mixed $const
+     * @param mixed $stats
+     */
+    public function testLOGEST($expectedResult, $yValues, $xValues, $const, $stats): void
+    {
+        $result = Statistical::LOGEST($yValues, $xValues, $const, $stats);
+
+        $elements = count($expectedResult);
+        for ($element = 0; $element < $elements; ++$element) {
+            self::assertEqualsWithDelta($expectedResult[$element], $result[$element], 1E-12);
+        }
+    }
+
+    public function providerLOGEST()
+    {
+        return require 'tests/data/Calculation/Statistical/LOGEST.php';
+    }
+}
diff --git a/tests/PhpSpreadsheetTests/Calculation/Functions/Statistical/LogInvTest.php b/tests/PhpSpreadsheetTests/Calculation/Functions/Statistical/LogInvTest.php
new file mode 100644
index 00000000..8371707d
--- /dev/null
+++ b/tests/PhpSpreadsheetTests/Calculation/Functions/Statistical/LogInvTest.php
@@ -0,0 +1,25 @@
+<?php
+
+namespace PhpOffice\PhpSpreadsheetTests\Calculation\Functions\Statistical;
+
+use PhpOffice\PhpSpreadsheet\Calculation\Statistical;
+use PHPUnit\Framework\TestCase;
+
+class LogInvTest extends TestCase
+{
+    /**
+     * @dataProvider providerLOGINV
+     *
+     * @param mixed $expectedResult
+     */
+    public function testLOGINV($expectedResult, ...$args): void
+    {
+        $result = Statistical::LOGINV(...$args);
+        self::assertEqualsWithDelta($expectedResult, $result, 1E-12);
+    }
+
+    public function providerLOGINV(): array
+    {
+        return require 'tests/data/Calculation/Statistical/LOGINV.php';
+    }
+}
diff --git a/tests/PhpSpreadsheetTests/Calculation/Functions/Statistical/MaxATest.php b/tests/PhpSpreadsheetTests/Calculation/Functions/Statistical/MaxATest.php
new file mode 100644
index 00000000..ce338e84
--- /dev/null
+++ b/tests/PhpSpreadsheetTests/Calculation/Functions/Statistical/MaxATest.php
@@ -0,0 +1,25 @@
+<?php
+
+namespace PhpOffice\PhpSpreadsheetTests\Calculation\Functions\Statistical;
+
+use PhpOffice\PhpSpreadsheet\Calculation\Statistical;
+use PHPUnit\Framework\TestCase;
+
+class MaxATest extends TestCase
+{
+    /**
+     * @dataProvider providerMAXA
+     *
+     * @param mixed $expectedResult
+     */
+    public function testMAXA($expectedResult, ...$args): void
+    {
+        $result = Statistical::MAXA(...$args);
+        self::assertEqualsWithDelta($expectedResult, $result, 1E-12);
+    }
+
+    public function providerMAXA(): array
+    {
+        return require 'tests/data/Calculation/Statistical/MAXA.php';
+    }
+}
diff --git a/tests/PhpSpreadsheetTests/Calculation/Functions/Statistical/MaxTest.php b/tests/PhpSpreadsheetTests/Calculation/Functions/Statistical/MaxTest.php
new file mode 100644
index 00000000..cd329aa9
--- /dev/null
+++ b/tests/PhpSpreadsheetTests/Calculation/Functions/Statistical/MaxTest.php
@@ -0,0 +1,25 @@
+<?php
+
+namespace PhpOffice\PhpSpreadsheetTests\Calculation\Functions\Statistical;
+
+use PhpOffice\PhpSpreadsheet\Calculation\Statistical;
+use PHPUnit\Framework\TestCase;
+
+class MaxTest extends TestCase
+{
+    /**
+     * @dataProvider providerMAX
+     *
+     * @param mixed $expectedResult
+     */
+    public function testMAX($expectedResult, ...$args): void
+    {
+        $result = Statistical::MAX(...$args);
+        self::assertEqualsWithDelta($expectedResult, $result, 1E-12);
+    }
+
+    public function providerMAX(): array
+    {
+        return require 'tests/data/Calculation/Statistical/MAX.php';
+    }
+}
diff --git a/tests/PhpSpreadsheetTests/Calculation/Functions/Statistical/MinATest.php b/tests/PhpSpreadsheetTests/Calculation/Functions/Statistical/MinATest.php
new file mode 100644
index 00000000..f24d1ca2
--- /dev/null
+++ b/tests/PhpSpreadsheetTests/Calculation/Functions/Statistical/MinATest.php
@@ -0,0 +1,25 @@
+<?php
+
+namespace PhpOffice\PhpSpreadsheetTests\Calculation\Functions\Statistical;
+
+use PhpOffice\PhpSpreadsheet\Calculation\Statistical;
+use PHPUnit\Framework\TestCase;
+
+class MinATest extends TestCase
+{
+    /**
+     * @dataProvider providerMINA
+     *
+     * @param mixed $expectedResult
+     */
+    public function testMINA($expectedResult, ...$args): void
+    {
+        $result = Statistical::MINA(...$args);
+        self::assertEqualsWithDelta($expectedResult, $result, 1E-12);
+    }
+
+    public function providerMINA(): array
+    {
+        return require 'tests/data/Calculation/Statistical/MINA.php';
+    }
+}
diff --git a/tests/PhpSpreadsheetTests/Calculation/Functions/Statistical/MinTest.php b/tests/PhpSpreadsheetTests/Calculation/Functions/Statistical/MinTest.php
new file mode 100644
index 00000000..a5a16588
--- /dev/null
+++ b/tests/PhpSpreadsheetTests/Calculation/Functions/Statistical/MinTest.php
@@ -0,0 +1,25 @@
+<?php
+
+namespace PhpOffice\PhpSpreadsheetTests\Calculation\Functions\Statistical;
+
+use PhpOffice\PhpSpreadsheet\Calculation\Statistical;
+use PHPUnit\Framework\TestCase;
+
+class MinTest extends TestCase
+{
+    /**
+     * @dataProvider providerMIN
+     *
+     * @param mixed $expectedResult
+     */
+    public function testMIN($expectedResult, ...$args): void
+    {
+        $result = Statistical::MIN(...$args);
+        self::assertEqualsWithDelta($expectedResult, $result, 1E-12);
+    }
+
+    public function providerMIN(): array
+    {
+        return require 'tests/data/Calculation/Statistical/MIN.php';
+    }
+}
diff --git a/tests/PhpSpreadsheetTests/Calculation/Functions/Statistical/SmallTest.php b/tests/PhpSpreadsheetTests/Calculation/Functions/Statistical/SmallTest.php
new file mode 100644
index 00000000..a40e5eb3
--- /dev/null
+++ b/tests/PhpSpreadsheetTests/Calculation/Functions/Statistical/SmallTest.php
@@ -0,0 +1,27 @@
+<?php
+
+namespace PhpOffice\PhpSpreadsheetTests\Calculation\Functions\Statistical;
+
+use PhpOffice\PhpSpreadsheet\Calculation\Statistical;
+use PHPUnit\Framework\TestCase;
+
+class SmallTest extends TestCase
+{
+    /**
+     * @dataProvider providerSMALL
+     *
+     * @param mixed $expectedResult
+     * @param mixed $values
+     * @param mixed $position
+     */
+    public function testSMALL($expectedResult, $values, $position): void
+    {
+        $result = Statistical::SMALL($values, $position);
+        self::assertEqualsWithDelta($expectedResult, $result, 1E-12);
+    }
+
+    public function providerSMALL()
+    {
+        return require 'tests/data/Calculation/Statistical/SMALL.php';
+    }
+}
diff --git a/tests/data/Calculation/Statistical/LARGE.php b/tests/data/Calculation/Statistical/LARGE.php
new file mode 100644
index 00000000..3a6adcba
--- /dev/null
+++ b/tests/data/Calculation/Statistical/LARGE.php
@@ -0,0 +1,34 @@
+<?php
+
+return [
+    [
+        5,
+        [3, 4, 5, 2, 3, 4, 5, 6, 4, 7],
+        3,
+    ],
+    [
+        4,
+        [3, 4, 5, 2, 3, 4, 5, 6, 4, 7],
+        7,
+    ],
+    [
+        2,
+        [3, 4, '5', 2, 3, 4, '5', '6', 4, '7'],
+        6,
+    ],
+    [
+        '#VALUE!',
+        [3, 4, 5, 2, 3, 4, 5, 6, 4, 7],
+        'NAN',
+    ],
+    [
+        '#NUM!',
+        [3, 4, 5, 2, 3, 4, 5, 6, 4, 7],
+        -1,
+    ],
+    [
+        '#NUM!',
+        [],
+        1,
+    ],
+];
diff --git a/tests/data/Calculation/Statistical/LINEST.php b/tests/data/Calculation/Statistical/LINEST.php
new file mode 100644
index 00000000..2b2680c7
--- /dev/null
+++ b/tests/data/Calculation/Statistical/LINEST.php
@@ -0,0 +1,11 @@
+<?php
+
+return [
+    [
+        [2.0, 1.0],
+        [1, 9, 5, 7],
+        [0, 4, 2, 3],
+        true,
+        false,
+    ],
+];
diff --git a/tests/data/Calculation/Statistical/LOGEST.php b/tests/data/Calculation/Statistical/LOGEST.php
new file mode 100644
index 00000000..e74db005
--- /dev/null
+++ b/tests/data/Calculation/Statistical/LOGEST.php
@@ -0,0 +1,11 @@
+<?php
+
+return [
+    [
+        [1.463275628116, 495.304770158727],
+        [33100, 47300, 69000, 102000, 150000, 220000],
+        [11, 12, 13, 14, 15, 16],
+        true,
+        false,
+    ],
+];
diff --git a/tests/data/Calculation/Statistical/LOGINV.php b/tests/data/Calculation/Statistical/LOGINV.php
new file mode 100644
index 00000000..d8b626a9
--- /dev/null
+++ b/tests/data/Calculation/Statistical/LOGINV.php
@@ -0,0 +1,24 @@
+<?php
+
+return [
+    [
+        4.000025209777,
+        0.039084, 3.5, 1.2,
+    ],
+    [
+        6.653346075337,
+        0.3, 2, 0.2,
+    ],
+    [
+        7.135708009256,
+        0.3, 2.5, 1.02,
+    ],
+    [
+        '#VALUE!',
+        1.1, 2.2, 'NAN',
+    ],
+    [
+        '#NUM!',
+        1.1, 2.2, 3.3,
+    ],
+];
diff --git a/tests/data/Calculation/Statistical/MAX.php b/tests/data/Calculation/Statistical/MAX.php
new file mode 100644
index 00000000..63585307
--- /dev/null
+++ b/tests/data/Calculation/Statistical/MAX.php
@@ -0,0 +1,16 @@
+<?php
+
+return [
+    [
+        27,
+        10, 7, 9, 27, 2,
+    ],
+    [
+        10,
+        10, 7, 9, '27', 2,
+    ],
+    [
+        0,
+        null, 'STRING', true, '', '27',
+    ],
+];
diff --git a/tests/data/Calculation/Statistical/MAXA.php b/tests/data/Calculation/Statistical/MAXA.php
new file mode 100644
index 00000000..7f9d7608
--- /dev/null
+++ b/tests/data/Calculation/Statistical/MAXA.php
@@ -0,0 +1,28 @@
+<?php
+
+return [
+    [
+        27,
+        10, 7, 9, 27, 2,
+    ],
+    [
+        10,
+        10, 7, 9, '17', 2,
+    ],
+    [
+        0,
+        -10, -7, -9, '17', -2,
+    ],
+    [
+        1,
+        -10, true, -9, '17', -2,
+    ],
+    [
+        1,
+        null, 'STRING', true, '', -2, 0, false, '27',
+    ],
+    [
+        0,
+        null, 'STRING', '', 'xl95',
+    ],
+];
diff --git a/tests/data/Calculation/Statistical/MIN.php b/tests/data/Calculation/Statistical/MIN.php
new file mode 100644
index 00000000..f5c350bd
--- /dev/null
+++ b/tests/data/Calculation/Statistical/MIN.php
@@ -0,0 +1,16 @@
+<?php
+
+return [
+    [
+        2,
+        10, 7, 2, 9, 27,
+    ],
+    [
+        -9,
+        10, 7, -9, '-27', 2,
+    ],
+    [
+        0,
+        null, 'STRING', true, '', '27',
+    ],
+];
diff --git a/tests/data/Calculation/Statistical/MINA.php b/tests/data/Calculation/Statistical/MINA.php
new file mode 100644
index 00000000..754f9aad
--- /dev/null
+++ b/tests/data/Calculation/Statistical/MINA.php
@@ -0,0 +1,28 @@
+<?php
+
+return [
+    [
+        2,
+        10, 7, 9, 27, 2,
+    ],
+    [
+        -7,
+        10, '-9', -7, '17', 2,
+    ],
+    [
+        0,
+        10, 7, 9, '17', 2,
+    ],
+    [
+        1,
+        10, true, 9, 2,
+    ],
+    [
+        0,
+        null, true, 2, false,
+    ],
+    [
+        0,
+        null, 'STRING', '', 'xl95',
+    ],
+];
diff --git a/tests/data/Calculation/Statistical/SMALL.php b/tests/data/Calculation/Statistical/SMALL.php
new file mode 100644
index 00000000..d3395660
--- /dev/null
+++ b/tests/data/Calculation/Statistical/SMALL.php
@@ -0,0 +1,34 @@
+<?php
+
+return [
+    [
+        3,
+        [1, 4, 8, 3, 7, 12, 54, 8, 23],
+        2,
+    ],
+    [
+        4,
+        [3, 4, 5, 2, 3, 4, 6, 4, 7],
+        4,
+    ],
+    [
+        6,
+        ['3', 4, 5, '2', '3', 4, 5, 6, 4, 7],
+        6,
+    ],
+    [
+        '#VALUE!',
+        [3, 4, 5, 2, 3, 4, 5, 6, 4, 7],
+        'NAN',
+    ],
+    [
+        '#NUM!',
+        [3, 4, 5, 2, 3, 4, 5, 6, 4, 7],
+        -1,
+    ],
+    [
+        '#NUM!',
+        [],
+        1,
+    ],
+];