Calculating a Dynamic Truncated Mean in Power BI Using DAX: A Quick Guide

Truncated mean provides a more robust measure of average by excluding a specified percentage of the smallest and largest values from the calculation. Modern Power BI models have a built-in TRIMMEAN function, but this function is often unavailable when using a Live Connection to an older Analysis Services (SSAS) model. This article provides a robust, manual DAX pattern that replicates this functionality and remains fully dynamic.