OPEN-SOURCE SCRIPT
META: Kahan Summation (Scripting Exercise)
I was curious to see what Pine uses to accumulate numbers. It looks like it uses the simple "add em up" approach, rather than a compensated summation. This means that especially for large numbers, there is an inherent error amount.
This script implements the Kahan Summation Algorithm, also known as compensated summation.
en.wikipedia.org/wiki/Kahan_summation_algorithm
This is part 2 of my study into the builtin stdev function. I think this is why it differs so much from the simple two-pass solution.
This script implements the Kahan Summation Algorithm, also known as compensated summation.
en.wikipedia.org/wiki/Kahan_summation_algorithm
This is part 2 of my study into the builtin stdev function. I think this is why it differs so much from the simple two-pass solution.
Open-source script
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 publication is governed by House rules. You can favorite it to use it on a chart.
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