I am trying to use the Kurtosis functions to examine the distribution
of a set of errors (forecast - actual). I am comparing the K values to
a histogram of the data.

To test I have deliberately peaked and flattened the distribution by
reducing the error values by 10%, 50% and 90% and increasing the error
values by 200%. The resulting histograms show the changes in
distribution for each adjusted set as you would expect but I am seeing
no change in the corresponding kurtosis values.

Anyone any ideas why this might be?