#### 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
Applying Advanced DAX Patterns
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# Computing absenteeism

Absenteeism is a measure of how much time employees are unavailable for work. Most often, this means that the amount of time employees are unavailable for work that is unexpected, in other words, employees calling off work for being sick or simply not showing up for work as opposed to absences that are planned such as vacations, holidays, family leave or long-term disability. Employees with chronic absenteeism can be a drain on business productivity and thus, in certain organizations, absenteeism is an important measure to track and analyze.

The basic formula for calculating an absenteeism rate is extremely simple—divide the number of days or hours of absence within a given time period by the total number of available days or hours within the same given time period. While this sounds extremely simple, it becomes harder when computing absenteeism across...