Hi Frank, Thanks for the question and the short test case.
As a first note, can you please clarify which estimate you would like to compute, variation coefficientVC=Sigma/E, where Sigma is standard deviation, andE - Expectation (Mean), or variance Sigma^2 = E(X-E(X))^2, E(X) - is expectation of random variable X?
Variation coefficient is defined by mean and standard deviation,square root ofsecond central moment.Computation of i-th central momentuses raw (algebraic) moments up to i-th order. In case of VC estimates, the library will compute mean and the second raw moment.For this reason youneed to allocate the buffersfor those estimates and make them available to the libraryby using Task Editor [d|s]SSEditTask. Size ofeach bufferis defined by dimension of task p (which equal to 1 in your case).