[pcabc]

I use the 200 day plot the same way as the Momentum Index, in that crosses below the zero line or a break down from an established long term range towards the zero line are things to take note of, as it is a long term indicator. So yes, is also used for confirmation purposes as it is often one of the last things to break down.

The standard (12,26,9) MACD line chart is the 12-day Exponential Moving Average (EMA) less the 26-day EMA, with a 9 signal line. So the '1,200,1' MACD is the 1 day Exponential Moving Average (EMA) less the 200-day EMA. So it is a little different than the plot of the price minus the 200 day MA, as that uses a simple day MA and not the Exponential Moving Average. But the difference is fairly minor, so could probably lose it.

Thanks for the explanation.  I'd not fully understood what you were doing with these plots.  Part of the reason for myself programming my own charts was to have a better understanding.

So, to understand you correctly, the MACD '1,200;1' will cross its zero line at the same time that the source data for the MACD would cross its own 200 day EMA.

I'm coming to the conclusion that the shorter 50 day / 10 week SMAs provide the warnings that you should take action and the longer 150 day / 30 week and 200 day / 40 week SMAs are the confirmation, or not, of those earlier warnings.