Function - Weighted Standard Deviation

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Calculates weighted mean, variance, standard deviation, MSE and RMSE from time series variables or arrays.
When calculating from arrays, the function expects index 0 to be the most recent sample and weight values.
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In true TradingView spirit, the author of this script has published it open-source, so traders can understand and verify it. Cheers to the author! You may use it for free, but reuse of this code in a publication is governed by House Rules. You can favorite it to use it on a chart.

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