could you please code the standard deviation indicator for forex tester?
stddev(n) = take the last n prices and plot the value of
sqrt[ 1/n * sum of index i from 1 to n of ( ({i-th value} - {mean value})^2) ]
see http://en.wikipedia.org/wiki/Standard_deviation (plotting the stddev of the last n values). If you do I'll definitely buy this software
. Thanks.