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 Days of Supply

Days of Supply, or DoS, is also known as Days In Inventory (DII). This metric is used in various ways but is often used as an efficiency metric to measure the average number of days organizations stock their inventory before selling that inventory. DoS is a useful measure for any organization that stocks inventory and can be a key metric when analyzing your supply chain. The calculation for DoS is given by the following formula:

Here, the numerator, AverageInventory, is the average inventory levels during an accounting period. The denominator, AverageSoldPerDay, is simply the average amount of inventory taken out of stock per day. AverageSoldPerDay can be calculated across any timeline, although often, 365 days or a year is used when calculating the average number or value of goods sold.

This recipe demonstrates how to calculate DoS when considering...