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Not sure if anyone noticed this little nugget from Marsten in the RT Forum
Parameters: len: 100 // or whatever you want
Data: roc1: roc(c,1) indroc1: extern($SPY, roc1) beta: slope(roc1, indroc1, len)
Is this the post you are talking about?
https://forum.mhptrading.com/t/beta-formula/1341
Actually no, but I can’t find the one I saw it in now. Doesn’t matter…I always wanted to test beta so now I can