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)

Totaling measures

Measure totals have been a problem since the dawn of placing DAX measures in table and matrix visualizations. The issue strikes at the core of the DAX language itself – context. The problem arises because the context in a total line for a table or matrix is effectively all rows. However, evaluating a DAX calculation in the context of all rows can often produce very different results than anticipated, which, for most users, would be the total of the numbers displayed in the rows of the table. However, DAX does not even consider the actual numbers displayed in rows of a table or matrix visualization when calculating the total line for a table or matrix visualization.

To be clear, DAX is doing exactly what it was programmed to do. The problem is that what it is doing is not in line with the expectations of users conditioned by decades of experience with...