Question

How do I create a measure that dynamically switches between different aggregation types based on user selection?
I need a Power BI measure that dynamically adjusts its aggregation type (e.g., sum, average, count) based on user selection in a slicer. The measure should be responsive to changes and update calculations accordingly. What is the best approach using DAX functions like SWITCH, SELECTEDVALUE, or IF to ensure the measure adapts correctly?

Answer 1

To create a dynamic aggregation measure in Power BI that switches between Sum, Average, Count, etc., based on user selection in a slicer, you can use DAX functions like SWITCH and SELECTEDVALUE. The measure should be responsive and update based on the slicer choice.

Best Approach Using DAX

1. Create an Aggregation Type Table

   • Manually create a table (e.g., AggregationType) with values: "Sum", "Average", "Count", etc.

   • Add this table as a disconnected table (no relationships).

   • Create a slicer using this table to let users choose an aggregation type.

2. Define the Dynamic Measure

DynamicAggregation = 
VAR SelectedAggregation = SELECTEDVALUE(AggregationType[Type], "Sum") 
RETURN 
SWITCH(
    SelectedAggregation,
    "Sum", SUM(Sales[Amount]),
    "Average", AVERAGE(Sales[Amount]),
    "Count", COUNT(Sales[Amount]),
    SUM(Sales[Amount]) -- Default to Sum if no selection
)

Ensure Correct Adaptation

• Use SELECTEDVALUE to get the user's slicer choice.

• SWITCH dynamically selects the right aggregation.

• Set a default aggregation to avoid blank results.