DATEADD : Used for time intelligence, such as calculating "Year-Over-Year" growth by shifting dates.
: Practical examples show how to compare current performance against the past and handle tricky calculations like running totals or non-numeric values. Practical PowerPivot & DAX Formulas for Excel
CALCULATE : The most powerful function, used to modify the filter context of a calculation. DATEADD : Used for time intelligence, such as
If you're looking for the "power" in PowerPivot, these common DAX functions highlighted by expert resources like Microsoft Support and Analytics Vidhya are essential: If you're looking for the "power" in PowerPivot,
: It bridges the gap between different data worlds, including appendixes for SQL, MDX, and DMX query design.
RANKX : Automatically ranks items (like products or sales reps) based on a specific value. Practical PowerPivot & DAX Formulas for Excel 2010
: The book includes simplified chapters designed to help users build sophisticated pivot tables in just a few minutes. Essential DAX Formulas for Power Users