Book Image

DAX Cookbook

By : Greg Deckler
Book Image

DAX Cookbook

By: Greg Deckler

Overview of this book

DAX provides an extra edge by extracting key information from the data that is already present in your model. Filled with examples of practical, real-world calculations geared toward business metrics and key performance indicators, this cookbook features solutions that you can apply for your own business analysis needs. You'll learn to write various DAX expressions and functions to understand how DAX queries work. The book also covers sections on dates, time, and duration to help you deal with working days, time zones, and shifts. You'll then discover how to manipulate text and numbers to create dynamic titles and ranks, and deal with measure totals. Later, you'll explore common business metrics for finance, customers, employees, and projects. The book will also show you how to implement common industry metrics such as days of supply, mean time between failure, order cycle time and overall equipment effectiveness. In the concluding chapters, you'll learn to apply statistical formulas for covariance, kurtosis, and skewness. Finally, you'll explore advanced DAX patterns for interpolation, inverse aggregators, inverse slicers, and even forecasting with a deseasonalized correlation coefficient. By the end of this book, you'll have the skills you need to use DAX's functionality and flexibility in business intelligence and data analytics.
Table of Contents (15 chapters)

Dealing with circular dependencies

Circular dependency errors in DAX are perhaps the most feared of all DAX errors. In short, a circular dependency is essentially a loop where a value, A, depends on another value, B, which depends on the original value, A. The reason that circular dependencies tend to be feared is that people do not necessarily understand where circular dependencies come from, and so circular dependencies can be complex and time-consuming to troubleshoot and resolve, especially in complex data models and complex DAX calculations. This recipe provides techniques to help you understand how circular dependencies get created as well as techniques to avoid circular dependencies.

Getting ready

To prepare for this...