CMOav

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//  Copyright by HPotter v1.0 18/04/2014
//    This indicator plots average of three different length CMO's. This indicator 
//    was developed by Tushar Chande. A scientist, an inventor, and a respected 
//    trading system developer, Mr. Chande developed the CMO to capture what he 
//    calls "pure momentum". For more definitive information on the CMO and other 
//    indicators we recommend the book The New Technical Trader by Tushar Chande 
//    and Stanley Kroll.
//    The CMO is closely related to, yet unique from, other momentum oriented 
//    indicators such as Relative Strength Index, Stochastic, Rate-of-Change, etc. 
//    It is most closely related to Welles Wilder?s RSI, yet it differs in several ways:
//    - It uses data for both up days and down days in the numerator, thereby directly 
//    measuring momentum;
//    - The calculations are applied on unsmoothed data. Therefore, short-term extreme 
//    movements in price are not hidden. Once calculated, smoothing can be applied to 
//    the CMO, if desired;
//    - The scale is bounded between +100 and -100, thereby allowing you to clearly see 
//    changes in net momentum using the 0 level. The bounded scale also allows you to 
//    conveniently compare values across different securities.
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study(title="CMOav", shorttitle="CMOav")
Length1 = input(5, minval=1)
Length2 = input(10, minval=1)
Length3 = input(20, minval=1)
TopBand = input(70, minval=1)
LowBand = input(-70, maxval=-1)
hline(0, color=purple, linestyle=dashed)
hline(TopBand, color=red, linestyle=line)
hline(LowBand, color=green, linestyle=line)
xMom = close - close[1]
xMomabs = abs(close - close[1])
nSum1 = sum(xMom, Length1)
nSumAbs1 = sum(xMomabs, Length1)
nSum2 = sum(xMom, Length2)
nSumAbs2 = sum(xMomabs, Length2)
nSum3 = sum(xMom, Length3)
nSumAbs3 = sum(xMomabs, Length3)
nRes = 100 * (nSum1 / nSumAbs1 + nSum2 / nSumAbs2 + nSum3 / nSumAbs3 ) / 3
plot(nRes, color=blue, title="CMOav")