To activate Power Pivot, go to File > Options, click Add-ins, select COM Add-ins from the dropdown, and check the box for ...

Data Analysis eXpressions (DAX) includes more powerful functions for BI type data manipulations, including iterative expressions, grouping, linking, and filtering. The full promise of PowerPivot is ...

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Note that DAX isn’t a substitute for the old formula language, but a complement to it; odds are you’ll still be using all of your existing Excel macro tricks in conjunction with PowerPivot.