In the attached workbook, created in v9, there is a table showing percentile rank calculations using the RANK_PERCENTILE function. If you open the same workbook in v10, the same function returns different results than if opened in v9.
Why does the same function calculate differently in v10 compared to v9?
... after some more research, I found this link which indicates that there was a change in algorithm for this function from v9.0 to v9.1. But this doesn't really explain why Tableau changed the algorithm. Is there any explanation for that?
Also, does this summary of calculation methodology exist for v10?