Problem: To use XLSTAT by typing in the formulas directly, you need to know the exact syntax for each formula. A list of all formulas / syntax rules does not exist (confirmed by XLSTAT support).
Example: To learn how to use the paramters for "=XLSTAT_MannWhitneyTest(Array1,Array2,Tail,Correction,ExactTest)" I needed to contact the XLSTAT support.
Solution: Provide a syntax compendium of XLSTAT functions, ideally with examples. Could be part of the build-in help file.