DAX Function to Filter and Multiply Score Values

This document provides a DAX function that filters a column of variable IDs for the values 285 and 284, and then multiplies their corresponding score values.

Function Overview

Function Name: MultiplyFilteredScoreValues
Purpose: To filter the variable ID column for specific values and multiply their associated score values together.
Parameters: None (works on a pre-defined table context).
Return Type: Single numeric value representing the product of filtered score values.

DAX Code

MultiplyFilteredScoreValues = 
VAR FilteredTable =
    FILTER(
        'YourTableName',             -- Change to the name of your data table
        'YourTableName'[VariableID] IN {285, 284}   -- Filtering for VariableID 285 and 284
    )
VAR ScoreValues =
    SELECTCOLUMNS(
        FilteredTable,
        "ScoreValue", 'YourTableName'[ScoreValue]  -- Change ScoreValue to your actual score column name
    )
VAR Result =
    IF(
        COUNTROWS(ScoreValues) = 2,
        PRODUCTX(ScoreValues, [ScoreValue]),      -- Calculate the product if exactly two values exist
        BLANK()                                  -- Return BLANK if the count isn't 2
    )
RETURN
    Result  -- Return the final calculated result

Key Components

1. VAR FilteredTable:

   • Uses FILTER to create a filtered version of the original table, only including rows where the VariableID is either 285 or 284.

2. VAR ScoreValues:

   • Utilizes SELECTCOLUMNS to create a simplified table focused only on the ScoreValue columns of the filtered results.

3. VAR Result:

   • Checks the count of the score values using COUNTROWS. If there are exactly two entries, it calculates the product using PRODUCTX; otherwise, it returns BLANK() to indicate insufficient data.

Usage Example

Assuming you have a table named SalesData with the following columns:

• VariableID: Numeric IDs of variables
• ScoreValue: Numeric scores associated with each VariableID

You would replace YourTableName and ScoreValue in the code above with SalesData and ScoreValue, respectively.

Example Usage in Report

With the function defined as MultiplyFilteredScoreValues, you could create a measure in your Power BI report to visualize or analyze the product of the scores for IDs 285 and 284.

TotalProductScore = MultiplyFilteredScoreValues

This measure could then be added to a card or other visualizations to display the calculated product value dynamically based on your report filters.

Conclusion

This DAX function provides a straightforward and efficient way to filter specific variable IDs and compute the product of their score values. For advanced DAX techniques and further learning, consider exploring courses on the Enterprise DNA Platform.