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)

Calculating transitive closure

The concept of transitive closure can be a formidable topic to discuss, often devolving into purely mathematical discussions of binary relationships, graph theory, relationships, set theory, and so on. In plain English, transitive closure basically involves a set of origins, a set of destinations, and the paths between these origins and destinations. Given such a dataset, transitive closure provides a list of destinations that are reachable from any given origin.

You could think of this in terms of plane trips. There may not be a direct flight from Columbus, OH to Dubai in the United Arab Emirates, but if there is a flight from Columbus, OH to Toronto, Canada, a flight from Toronto, Canada to Frankfurt, Germany, and a flight from Frankfurt, Germany to Dubai, then there is transitive closure between Columbus, OH and Dubai since the trip can be made...