diff --git a/Math/Exception/ZeroDevisionException.php b/Math/Exception/ZeroDevisionException.php
new file mode 100644
index 000000000..e8a904cdb
--- /dev/null
+++ b/Math/Exception/ZeroDevisionException.php
@@ -0,0 +1,44 @@
+<?php
+/**
+ * Orange Management
+ *
+ * PHP Version 7.1
+ *
+ * @category   TBD
+ * @package    TBD
+ * @author     OMS Development Team <dev@oms.com>
+ * @copyright  Dennis Eichhorn
+ * @license    OMS License 1.0
+ * @version    1.0.0
+ * @link       http://orange-management.com
+ */
+declare(strict_types=1);
+
+namespace phpOMS\Math\Exception;
+
+/**
+ * Zero devision exception.
+ *
+ * @category   Framework
+ * @package    phpOMS/Uri
+ * @author     OMS Development Team <dev@oms.com>
+ * @license    OMS License 1.0
+ * @link       http://orange-management.com
+ * @since      1.0.0
+ */
+class ZeroDevisionException extends \UnexpectedValueException
+{
+    /**
+     * Constructor.
+     *
+     * @param string     $message Exception message
+     * @param int        $code    Exception code
+     * @param \Exception Previous exception
+     *
+     * @since  1.0.0
+     */
+    public function __construct(string $message = '', int $code = 0, \Exception $previous = null)
+    {
+        parent::__construct('Devision by zero is not defined.', $code, $previous);
+    }
+}
diff --git a/Math/Finance/FinanceFormulas.php b/Math/Finance/FinanceFormulas.php
index dec6931fb..dfa52c8fa 100644
--- a/Math/Finance/FinanceFormulas.php
+++ b/Math/Finance/FinanceFormulas.php
@@ -17,6 +17,7 @@ declare(strict_types=1);
 namespace phpOMS\Math\Finance;
 
 use phpOMS\Math\Statistic\Average;
+use phpOMS\Math\Matrix\Exception\InvalidDimensionException;
 
 /**
  * Finance class.
@@ -1036,7 +1037,7 @@ class FinanceFormulas
      *
      * @return float
      *
-     * @throws \Exception
+     * @throws InvalidDimensionException Throws this exception if the length of the array is 0
      *
      * @since  1.0.0
      */
@@ -1045,7 +1046,7 @@ class FinanceFormulas
         $count = count($C);
 
         if ($count === 0) {
-            throw new \Exception('Dimension');
+            throw new InvalidDimensionException($count);
         }
 
         $npv = -$C[0];
diff --git a/Math/Matrix/Exception/InvalidDimensionException.php b/Math/Matrix/Exception/InvalidDimensionException.php
new file mode 100644
index 000000000..c4ac860d6
--- /dev/null
+++ b/Math/Matrix/Exception/InvalidDimensionException.php
@@ -0,0 +1,44 @@
+<?php
+/**
+ * Orange Management
+ *
+ * PHP Version 7.1
+ *
+ * @category   TBD
+ * @package    TBD
+ * @author     OMS Development Team <dev@oms.com>
+ * @copyright  Dennis Eichhorn
+ * @license    OMS License 1.0
+ * @version    1.0.0
+ * @link       http://orange-management.com
+ */
+declare(strict_types=1);
+
+namespace phpOMS\Math\Matrix\Exception;
+
+/**
+ * Zero devision exception.
+ *
+ * @category   Framework
+ * @package    phpOMS/Uri
+ * @author     OMS Development Team <dev@oms.com>
+ * @license    OMS License 1.0
+ * @link       http://orange-management.com
+ * @since      1.0.0
+ */
+class InvalidDimensionException extends \UnexpectedValueException
+{
+    /**
+     * Constructor.
+     *
+     * @param string     $message Exception message
+     * @param int        $code    Exception code
+     * @param \Exception Previous exception
+     *
+     * @since  1.0.0
+     */
+    public function __construct(string $message, int $code = 0, \Exception $previous = null)
+    {
+        parent::__construct('Dimension "' . $message . '" is not valid.', $code, $previous);
+    }
+}
diff --git a/Math/Matrix/Matrix.php b/Math/Matrix/Matrix.php
index 83ac066ec..b6ce4181a 100644
--- a/Math/Matrix/Matrix.php
+++ b/Math/Matrix/Matrix.php
@@ -16,6 +16,8 @@ declare(strict_types=1);
 
 namespace phpOMS\Math\Matrix;
 
+use phpOMS\Math\Matrix\Exception\InvalidDimensionException;
+
 /**
  * Matrix class
  *
@@ -85,14 +87,14 @@ class Matrix implements \ArrayAccess, \Iterator
      * @param int $n     Column
      * @param int $value Value
      *
-     * @throws DimensionException
+     * @throws InvalidDimensionException
      *
      * @since  1.0.0
      */
     public function set(int $m, int $n, $value) /* : void */
     {
         if (!isset($this->matrix[$m][$n])) {
-            throw new DimensionException($m, $n);
+            throw new InvalidDimensionException($m . 'x' . $n);
         }
 
         $this->matrix[$m][$n] = $value;
@@ -106,14 +108,14 @@ class Matrix implements \ArrayAccess, \Iterator
      *
      * @return mixed
      *
-     * @throws DimensionException
+     * @throws InvalidDimensionException
      *
      * @since  1.0.0
      */
     public function get(int $m, int $n)
     {
         if (!isset($this->matrix[$m][$n])) {
-            throw new DimensionException($m, $n);
+            throw new InvalidDimensionException($m . 'x' . $n);
         }
 
         return $this->matrix[$m][$n];
@@ -172,7 +174,7 @@ class Matrix implements \ArrayAccess, \Iterator
     public function setMatrix(array $matrix) : Matrix
     {
         if ($this->m !== count($matrix) || $this->n !== count($matrix[0])) {
-            throw new DimensionException(count($matrix), count($matrix[0]));
+            throw new InvalidDimensionException(count($matrix) . 'x' . count($matrix[0]));
         }
 
         $this->matrix = $matrix;
@@ -238,7 +240,7 @@ class Matrix implements \ArrayAccess, \Iterator
     private function addMatrix(Matrix $matrix) : Matrix
     {
         if ($this->m !== $matrix->getM() || $this->n !== $matrix->getN()) {
-            throw new DimensionException($matrix->getM(), $matrix->getN());
+            throw new InvalidDimensionException($matrix->getM() . 'x' . $matrix->getN());
         }
 
         $matrixArr    = $matrix->getMatrix();
@@ -346,7 +348,7 @@ class Matrix implements \ArrayAccess, \Iterator
         $mDim = $matrix->getM();
 
         if ($this->n !== $mDim) {
-            throw new DimensionException($mDim, $nDim);
+            throw new InvalidDimensionException($mDim . 'x' . $nDim);
         }
 
         $matrixArr    = $matrix->getMatrix();
@@ -485,14 +487,14 @@ class Matrix implements \ArrayAccess, \Iterator
      *
      * @return Matrix
      *
-     * @throws \Exception
+     * @throws InvalidDimensionException
      *
      * @since  1.0.0
      */
     public function inverse(int $algorithm = InverseType::GAUSS_JORDAN) : Matrix
     {
         if ($this->n !== $this->m) {
-            throw new DimensionException($this->m, $this->n);
+            throw new InvalidDimensionException($this->m . 'x' . $this->n);
         }
 
         switch ($algorithm) {
diff --git a/Math/Statistic/Average.php b/Math/Statistic/Average.php
index b24bce3d9..9ff91afa9 100644
--- a/Math/Statistic/Average.php
+++ b/Math/Statistic/Average.php
@@ -16,6 +16,9 @@ declare(strict_types=1);
 
 namespace phpOMS\Math\Statistic;
 
+use phpOMS\Math\Exception\ZeroDevisionException;
+use phpOMS\Math\Matrix\Exception\InvalidDimensionException;
+
 /**
  * Average class.
  *
@@ -130,14 +133,14 @@ class Average
      *
      * @return float
      *
-     * @throws \Exception
+     * @throws InvalidDimensionException This exception is thrown in case both parameters have different array length
      *
      * @since  1.0.0
      */
     public static function weightedAverage(array $values, array $weight) : float
     {
         if (($count = count($values)) !== count($weight)) {
-            throw new \Exception('Dimension');
+            throw new InvalidDimensionException(count($values) . 'x' . count($weight));
         }
 
         $avg = 0.0;
@@ -167,7 +170,7 @@ class Average
         $count = count($values);
 
         if ($count === 0) {
-            throw new \Exception('Division zero');
+            throw new ZeroDevisionException();
         }
 
         return array_sum($values) / $count;
@@ -239,7 +242,7 @@ class Average
         $count = count($values);
 
         if ($count === 0) {
-            throw new \Exception('Division zero');
+            throw new ZeroDevisionException();
         }
 
         return pow(array_product($values), 1 / $count);
@@ -272,7 +275,7 @@ class Average
 
         foreach ($values as $value) {
             if ($value === 0) {
-                throw new \Exception('Division zero');
+                throw new ZeroDevisionException();
             }
 
             $sum += 1 / $value;
diff --git a/Math/Statistic/Forecast/Regression/LevelLogRegression.php b/Math/Statistic/Forecast/Regression/LevelLogRegression.php
index 63a219150..24d858911 100644
--- a/Math/Statistic/Forecast/Regression/LevelLogRegression.php
+++ b/Math/Statistic/Forecast/Regression/LevelLogRegression.php
@@ -16,6 +16,8 @@ declare(strict_types=1);
 
 namespace phpOMS\Math\Statistic\Forecast\Regression;
 
+use phpOMS\Math\Matrix\Exception\InvalidDimensionException;
+
 /**
  * Regression class.
  *
@@ -33,8 +35,8 @@ class LevelLogRegression extends RegressionAbstract
      */
     public static function getRegression(array $x, array $y) : array
     {
-        if (($c = count($x)) != count($y)) {
-            throw new \Exception('Dimension');
+        if (($c = count($x)) !== count($y)) {
+            throw new InvalidDimensionException($c . 'x' . count($y));
         }
 
         for ($i = 0; $i < $c; $i++) {
diff --git a/Math/Statistic/Forecast/Regression/LogLevelRegression.php b/Math/Statistic/Forecast/Regression/LogLevelRegression.php
index bc0102c33..ea1b3d663 100644
--- a/Math/Statistic/Forecast/Regression/LogLevelRegression.php
+++ b/Math/Statistic/Forecast/Regression/LogLevelRegression.php
@@ -16,6 +16,8 @@ declare(strict_types=1);
 
 namespace phpOMS\Math\Statistic\Forecast\Regression;
 
+use phpOMS\Math\Matrix\Exception\InvalidDimensionException;
+
 /**
  * Regression class.
  *
@@ -33,8 +35,8 @@ class LogLevelRegression extends RegressionAbstract
      */
     public static function getRegression(array $x, array $y) : array
     {
-        if (($c = count($x)) != count($y)) {
-            throw new \Exception('Dimension');
+        if (($c = count($x)) !== count($y)) {
+            throw new InvalidDimensionException($c . 'x' . count($y));
         }
 
         for ($i = 0; $i < $c; $i++) {
diff --git a/Math/Statistic/Forecast/Regression/LogLogRegression.php b/Math/Statistic/Forecast/Regression/LogLogRegression.php
index 2350cc3a4..cb823cf78 100644
--- a/Math/Statistic/Forecast/Regression/LogLogRegression.php
+++ b/Math/Statistic/Forecast/Regression/LogLogRegression.php
@@ -16,6 +16,8 @@ declare(strict_types=1);
 
 namespace phpOMS\Math\Statistic\Forecast\Regression;
 
+use phpOMS\Math\Matrix\Exception\InvalidDimensionException;
+
 /**
  * Regression class.
  *
@@ -33,8 +35,8 @@ class LogLogRegression extends RegressionAbstract
      */
     public static function getRegression(array $x, array $y) : array
     {
-        if (($c = count($x)) != count($y)) {
-            throw new \Exception('Dimension');
+        if (($c = count($x)) !== count($y)) {
+            throw new InvalidDimensionException($c . 'x' . count($y));
         }
 
         for ($i = 0; $i < $c; $i++) {
diff --git a/Math/Statistic/Forecast/Regression/RegressionAbstract.php b/Math/Statistic/Forecast/Regression/RegressionAbstract.php
index ca674f01e..7c6821a82 100644
--- a/Math/Statistic/Forecast/Regression/RegressionAbstract.php
+++ b/Math/Statistic/Forecast/Regression/RegressionAbstract.php
@@ -18,6 +18,7 @@ declare(strict_types=1);
 use phpOMS\Math\Statistic\Average;
 use phpOMS\Math\Statistic\Forecast\ForecastIntervalMultiplier;
 use phpOMS\Math\Statistic\MeasureOfDispersion;
+use phpOMS\Math\Matrix\Exception\InvalidDimensionException;
 
 abstract class RegressionAbstract
 {
@@ -31,14 +32,14 @@ abstract class RegressionAbstract
      *
      * @return array [b0 => ?, b1 => ?]
      *
-     * @throws \Exception
+     * @throws InvalidDimensionException Throws this exception if the dimension of both arrays is not equal.
      *
      * @since  1.0.0
      */
     public static function getRegression(array $x, array $y) : array
     {
-        if (count($x) != count($y)) {
-            throw new \Exception('Dimension');
+        if (count($x) !== count($y)) {
+            throw new InvalidDimensionException(count($x) . 'x' . count($y));
         }
 
         $b1 = self::getBeta1($x, $y);
diff --git a/Math/Statistic/MeasureOfDispersion.php b/Math/Statistic/MeasureOfDispersion.php
index 6c66d9622..7fe6bd519 100644
--- a/Math/Statistic/MeasureOfDispersion.php
+++ b/Math/Statistic/MeasureOfDispersion.php
@@ -16,6 +16,9 @@ declare(strict_types=1);
 
 namespace phpOMS\Math\Statistic;
 
+use phpOMS\Math\Exception\ZeroDevisionException;
+use phpOMS\Math\Matrix\Exception\InvalidDimensionException;
+
 /**
  * Measure of dispersion.
  *
@@ -67,7 +70,7 @@ class MeasureOfDispersion
         $mean = Average::arithmeticMean($values);
 
         if ($mean === 0) {
-            throw new \Exception('Division zero');
+            throw new ZeroDevisionException();
         }
 
         return self::standardDeviation($values) / $mean;
@@ -107,7 +110,7 @@ class MeasureOfDispersion
         $count = count($values);
 
         if ($count < 2) {
-            throw new \Exception('Division zero');
+            throw new ZeroDevisionException();
         }
 
         return $count * self::empiricalVariance($values) / ($count - 1);
@@ -131,7 +134,7 @@ class MeasureOfDispersion
         $count = count($values);
 
         if ($count === 0) {
-            throw new \Exception('Division zero');
+            throw new ZeroDevisionException();
         }
 
         $mean = Average::arithmeticMean($values);
@@ -154,7 +157,7 @@ class MeasureOfDispersion
      *
      * @return float
      *
-     * @throws \Exception
+     * @throws InvalidDimensionException
      *
      * @since  1.0.0
      */
@@ -163,11 +166,11 @@ class MeasureOfDispersion
         $count = count($x);
 
         if ($count < 2) {
-            throw new \Exception('Division zero');
+            throw new ZeroDevisionException();
         }
 
         if ($count !== count($y)) {
-            throw new \Exception('Dimensions');
+            throw new InvalidDimensionException($count . 'x' . count($y));
         }
 
         $xMean = Average::arithmeticMean($x);