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)

Applying the hypergeometric distribution formula

The hypergeometric distribution is a probability distribution that defines the probability of having a specified amount of success (k) within a specified number of attempts (n) for a given population of N with K items with the desired feature. So, if we consider a deck of cards, what is the probability of drawing 2 (k) jacks within 10 (n) draws from a deck of 52 (N) cards in which there are 4 (K) jacks? The formula for the hypergeometric distribution formula is as follows:

Those odd-looking things in parenthesis are binomial distributions (combinations).

Not only constrained to gambling, the hypergeometric distribution has a wide range of uses and can be used to determine the statistical significance of specific events (successes). Thus, we can use the hypergeometric distribution to determine under- or over-representation of a...