Data Analysis Expressions (DAX) is the standard PowerPivot formula language that supports custom calculations in PowerPivot tables and Excel PivotTables. While many of the functions used in Excel are included, DAX also offers additional functions for carrying out dynamic aggregation and other operations with your data. Bill's new series serves as a progressive introduction to PowerPivot and DAX formulas, examining the functions, operators and values involved, and offering a wealth of practical examples.