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Thankyou very much for this. Went with
R1:=ROC(C,13,%);
R2:=Cum(R1);
R3:=Cum(R1*R1);
nn:=Cum(R3>0);
Sqrt( ( R3 - R2 * R2 / NN ) / Max( NN - 1, 1 ) );
The final line got rid of the error as you though. checked out the
calculations in excel and there the same. Enjoyed this, worked through
the formula and can see how and were its doint calculations. Also
learnt alot about calculating stdev. Thankyou again
regards Robert
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