Correlation returns the weighted correlation between the samples of x and y with the given means. sum_i {w_i (x_i - meanX) * (y_i - meanY)} / (stdX * stdY) The lengths of x and y must be equal. If weights is nil then all of the weights are 1. If weights is not nil, then len(x) must equal len(weights
(x, y, weights []float64)
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