[pcabc]

There was a reason. But I can't remember exactly now as I set it up around 10 years ago. But I do know the McClellan Oscillator https://www.investopedia.com/terms/m/mcc...llator.asp is made up of the 19 day EMA and the 39 day EMA of the advance decline line data. So the 10 and 30 day EMAs that I use are just a bit faster and obviously tie in with Stage Analysis.

I think with things like these you could use any combination of short and medium term MAs and the results wouldn't be much different. i.e isn't the MACD a 12 day EMA – 26 day EMA for example.

Interesting, as I've effectively been using the adjusted net advances to calculate my advance / decline line so I am more than half way to that indicator if I so wish anyway.