#### 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.
Preface
Thinking in DAX
Tangling with Time and Duration
Transforming Text and Numbers
Evaluating Employment Measures
Processing Project Performance
Calculating Common Industry Metrics
Solving Statistical and Mathematical Formulas
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# Creating a Net Promoter Score

The Net Promoter Score (NPS) is a metric that is based on responses to the question, "How likely is it that you would recommend our company/product/service to a friend or colleague?" The response to this question is generally scored on a scale from 0 to 10, with 0 being highly unlikely and 10 being very likely. The NPS is a registered trademark of Fred Reichheld, Bain & Company, and Satmetrix.

Responses to the question are categorized into the following groups:

• 0 - 6: Detractors
• 7 - 8: Passives
• 9 - 10: Promoters

The formula used for the NPS subtracts the percentage of detractors from the percentage of promoters and returns a value from -100 to 100.

This recipe demonstrates how to calculate the NPS using DAX.