Some time ago, I read the interesting blog post „Function Improvements in Excel 2010” on the Microsoft Excel Team Blog. They report about the changed formulas in Excel 2010 and about the improvements made to the calculation algorithms for these formulas. I’m not a statistician and I can’t really use all those statistical formulas, but I’m curious and I would like to examine how the results returned by the affected formulas differ in the different Excel Versions. For doing this, I have choosen the GAMMALN() function because this formula just only needs one argument. You can download a sample workbook at the end of this article.