(PECL stats >= 1.0.0)
stats_covariance — Computes the covariance of two data sets
stats_covariance ( array $a , array $b ) : float
Returns the covariance of a
and b
.
a
The first array
b
The second array
Returns the covariance of a
and b
, or false
on failure.
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https://www.php.net/manual/en/function.stats-covariance.php