Relative Strength to SPX

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// Relative Strength to index as used by Leaf_West
//On Leaf's weekly and monthly R/S charts, he uses a 13EMA of the R/S (brown dash line) 
//and an 8SMA of the 13EMA (pink solid line). 
//For daily or 130-minute time periods,  R/S charts are slightly different - 
//the moving averages of the R/S line include a 20EMA (brown dash line), a 50EMA (blue dash line) 
//and an 8SMA of the20EMA (pink solid line). 
//The momentum indicator is also slightly different from the weekly/monthly charts – 
//here he uses a 12 period calculation (vs 8 period for the weekly/monthly charts).
study(shorttitle = " Relative Strength", title="Relative strength to SPX", overlay=false)

sym = input(title="Symbol", type=symbol, defval="SPY")
src = input(title="Source", type=source, defval=close)

s = security("sym", "1", src)
s3= close/s*100

plot(s3, color=black,title=" rel chart strength")

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