If you take a price chart and superimpose the moving average over the top, you will see the price is sometimes above the average and at other times below. The Price Minus Average is simply the difference between the two.
The value of the PMA is that it allows you to see clearly how big the difference is between the current price and a long term average figure.

Click here for the full size graph.
To obtain buy and sell signals, you have the same options as you did with the momentum indicator.
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