Here is the Formulas to calculate the coppock indicator extracted from incredible charts

To calculate the Coppock Value:

1)Calculate 14 month Rate of Change (Price) for the index. Use monthly closing price.
2)Calculate 11 month Rate of Change (Price) for the index. Use monthly closing price.
3)Add the results of 1 and 2.
4)Calculate a 10 month weighted moving average of the result.

There are a number of variations in calculation. For a more timely signal, try substituting the daily equivalent in place of monthly figures: 294 day ROC, 231 day ROC and 210 day weighted moving averages. Based on these formula i had coded for the coppock
value using 294,231,210 ROC values which suits for the daily time frame. Here is the simple coppock AFL code

For Daily time frame, Coppock can be calculated as

1)Calculate 294 day Rate of Change (Price) for the index. Use Daily closing price.
2)Calculate 231 day Rate of Change (Price) for the index. Use Daily closing price.
3)Add the results of 1 and 2.
4)Calculate a 210 day weighted moving average of the result.

Coppock AFL Code

_SECTION_BEGIN(“Coppock”);

GraphXSpace=1;
Param(“WMA”,210,2,100,1,0);
r1=ROC(C,294);
r2=ROC(C,231);
r3=r1+r2;
CP=WMA(r3,210);

Color = IIf (CP >0, colorGreen, colorRed );
Plot(CP,”", Color ,styleHistogram | styleThick );
Plot(CP, StrFormat(“Coppock Value”, CP), colorGreen, styleLine);

_SECTION_END();

Nifty Coppock had turned to positive during the end of OCT 2009. Check the above historical Nifty chart for Coppock values

Here is an interesting reading about Coppock Indicator and its history from DNA India

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