Percent difference between price and MA

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//  Copyright by HPotter v1.0 04/04/2015
// Percent difference between price and MA
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study(title="Percent difference between price and MA")
Length = input(14, minval=1)
xSMA = sma(close, Length)
nRes = abs(close - xSMA) * 100 / close
plot(nRes, color=blue, title="PD MA")