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docs/math/statistic.md

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-# Statistic
-
-Selected statistical methods.
-
-## Correlation
-
-Correlation coefficients are used in statistics to measure how strong a relationship is between two variables. There are several types of correlation coefficient.
-
-### Pearson correlation
-
-Pearson’s correlation or Pearson correlation is a correlation coefficient commonly used in linear regression.
-
-Example:
-
-```
-use Phpml\Math\Statistic\Correlation;
-
-$x = [43, 21, 25, 42, 57, 59];
-$y = [99, 65, 79, 75, 87, 82];
-
-Correlation::pearson($x, $y);
-// return 0.549
-```
-
-## Mean
-
-### Arithmetic
-
-Example:
-
-```
-use Phpml\Math\Statistic\Mean;
-
-Mean::arithmetic([2, 5];
-// return 3.5
-
-Mean::arithmetic([0.5, 0.5, 1.5, 2.5, 3.5];
-// return 1.7
-```
-
-## Median
-
-Example:
-
-```
-use Phpml\Math\Statistic\Mean;
-
-Mean::median([5, 2, 6, 1, 3, 4]);
-// return 3.5
-
-Mean::median([5, 2, 6, 1, 3]);
-// return 3
-```
-
-## Mode
-
-Example:
-
-```
-use Phpml\Math\Statistic\Mean;
-
-Mean::mode([5, 2, 6, 1, 3, 4, 6, 6, 5]);
-// return 6
-```
-
-## Standard Deviation
-
-Example:
-
-```
-use Phpml\Math\Statistic\StandardDeviation;
-
-$population = [5, 6, 8, 9];
-StandardDeviation::population($population)
-// return 1.825
-
-$population = [7100, 15500, 4400, 4400, 5900, 4600, 8800, 2000, 2750, 2550,  960, 1025];
-StandardDeviation::population($population)
-// return 4079
-```