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On sales forecasting by combining multiple factors

For example, suppose you have sales data with the following data.

  • Date (Quarter, month, day, weekday)
  • Weather (atmospheric temperature)

I could use the "Forecast" function of Power BI to generate a sales forecast on a line graph.

However, it seems that only dates, etc. can be achieved, and multiple elements cannot be used.

Is it possible to combine two or more factors (date+weekday+temperature) to calculate a sales forecast?


If you know of any good methods or ways to achieve this, please let me know.

* By the way, about the factors to be used...
Since we have already calculated the correlation coefficient, we assume that only elements with a correlation coefficient of 0.8 or higher will be used.


2022-01-09 211756.png

Red text: Temperature obtained from weather forecast
Yellow cell: Sales value to be predicted


Best regards


Super User
Super User

You'd need to write your own forecast formula. Multilinear regression is possible in DAX (I've done it myself) but a lot of work since DAX doesn't have built-in matrix algebra functions. DAX isn't great for complex predictive analytics since you need to essentially build everything from scratch, even determinants and matrix inversion.


As a side note, I'd be surprised if those independent variables have a >0.8 correlation coefficient all combined, much less individually.

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