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/lib/mlbackend/php/phpml/src/Phpml/Math/Statistic/ -> Covariance.php (source)

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Defines 1 class

Covariance:: (3 methods):
  fromXYArrays()
  fromDataset()
  covarianceMatrix()


Class: Covariance  - X-Ref

fromXYArrays(array $x, array $y, bool $sample = true, ?float $meanX = null, ?float $meanY = null)   X-Ref
Calculates covariance from two given arrays, x and y, respectively


fromDataset(array $data, int $i, int $k, bool $sample = true, ?float $meanX = null, ?float $meanY = null)   X-Ref
Calculates covariance of two dimensions, i and k in the given data.


covarianceMatrix(array $data, ?array $means = null)   X-Ref
Returns the covariance matrix of n-dimensional data

param: array|null $means