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DAX Guide: Measures, Calculated Columns and Context
The foundations of DAX in Power BI: the five places a calculation can live, how to decide between a measure and a calculated column, what row context and filter context mean, why an averaged margin column came out at nearly double the true margin on real data, iterators, and habits for writing reliable measures.
Creating Calculated Columns vs Measures in Power BI
The simplest test for calculated columns versus measures in Power BI is whether the value should change when someone filters the report. Columns are worked out once at refresh; measures respond to every filter. A worked example on bike-sharing data shows what happens to running totals and ranks when you choose wrongly.