(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.
aThe first array
bThe 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