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How To Create Difficult Measures In Power BI

Matt Allington walks through his process of how he creates measures in Power BI:

Killer Tip 1: Create Good Test Data

The first thing I did was to replicate the test data shown above.  As I have mentioned many times, good quality test data is essential to getting a quick correct answer to your problem.  The data from the OP looked pretty good as it had covered the relevant scenarios (1 ID had just blue, 1 ID had blue and red, several IDs had no blue – this is good test data).

Starting out with good test data is vital—it helps you clarify exactly what it is you want, and if you come up with edge cases, you have the makings of a good test workbench to ensure that your code actually works, and not just in the simplest scenario.