Depending on the method used, wrong results are returned:
- exact -> correct
- monteCarlo -> wrong (returns a very small p-value)
- approximate -> wrong (returns 0 instead of 1)
The problem for the approximate version is due to this code snippet in ksSum
should rather return 0 in this case, but needs to be verified.
This problem was hidden (due to wrong statistic calculation) in previous versions of commons-math or resulted in a TooManyIterationsException (if statistic is 0 as correct in case of identical values).