The “Pretty Good Oscillator” (PGO) by Mark Johnson measures the distance of the current close from its N-day simple moving average (see Simple Moving Average), expressed in terms of an average true range (see Average True Range) over a similar period.
close - SMA[N] of closes PGO = ------------------------ EMA[N] of true range
So for instance a PGO value of +2.5 would mean the current close is 2.5 average days’ range above the SMA.
Johnson’s approach was to use it as a breakout system for longer term trades. If the PGO rises above 3.0 then go long, or below -3.0 then go short, and in both cases exit on returning to zero (which is a close back at the SMA).
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