Forum Discussion
Excel Calc in Power BI
Hi Rehansaeed2024 ,
Thanks for confirming that the results are matching in the reference PBIX. This confirms that the Excel decayed SUMPRODUCT logic is correctly implemented in Power BI using DAX.The issues you are facing in your actual PBIX are not due to the formula, but mainly because of model structure and data size. The circular dependency error usually comes when a measure like Numerator_Decayed is used directly or indirectly inside a calculated column, or when the Row Index itself is created using measures. In the working PBIX, the Row Index is a simple calculated column, and both Numerator and Denominator are measures only, which avoids this issue.
The “Query exceeded available resources” message happens when the SUMX + FILTER logic runs over a very large or highly detailed dataset. In such cases, the data grain or Row Index scope needs to be reduced to improve performance.
When you see 0.00 values for smaller datasets, it usually means the Row Index is not stable or the table is not sorted in the same order as Excel before assigning the index. Since Excel’s ROW() depends on position, sorting is very important.
Please use the attached PBIX as a reference for how the Row Index and measures should be structured. Once the same separation and sorting are applied in your actual model, the Numerator_Decayed will behave exactly the same as Excel.
Hi Rehansaeed2024 ,
I've recreated your entire scenario in a new sample .pbix file to verify the behavior. After setting up the same tables, adding the Row Index, and applying the decay based numerator and denominator logic, I was able to reproduce the exact expected output on my side. Both the running numerator calculation and the denominator values are working correctly when the DAX measures are created under the LineItems table.
This confirms that the logic you are using is valid, and Power BI calculates the decayed SUMPRODUCT pattern exactly as intended once the Row Index and Alpha value are set up properly. For your reference, I've attached the working .pbix file so you can compare it with your model and follow the steps used to get the final result.
YOur results are not matching as per my Excel file.