Upside-Downside and Custom Standard Deviation

This function can be used to calculate Upside/Downside standard deviation or any other custom standard deviation.

As an example, let us say you want to calculate standard deviation of returns but just returns that occurred while a particular stock was trading below its long-term or 250-bar moving average. That particular standard deviation is very easy to calculate using this custom standard deviation function. You just have to type this:

a = StddevC(perf(close, 1), 200, close > open);
plot(a, "", colorRed);


Note that the function name is similar to the built-in standard deviation function. You just need to add "C" at the end of the function.
Also don't forget that you need to download the indicator first in order to use it. Just click on the "Download" link/button below.

Here is another quick example.
Calculate the difference between upside and downside standard deviation for the past 200 trading bars:

r = perf(close, 1);
up = StddevC(r, 200, r > 0);
dw = StddevC(r, 200, r < 0);
dif = up - dw;
plot(dif, "Difference between Upside and Downside standard deviation", colorBlue);

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