Fix covariance of arrays with null values #585
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The covariance formula divides by 'n'. In case of arrays with null values, 'n' should not be set to the length but the number of non null outputs.
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The covariance formula divides by 'n'. In
case of arrays with null values, 'n' should
not be set to the length but the number of
non null outputs.
#357