Jeff Sauro • September 17, 2004
The Power of Z
A common statistical way of standardizing data on one scale so a comparison can take place is using a z-score. The z-score is like a common yard stick for all types of data. Each z-score corresponds to a point in a normal distribution and as such is sometimes called a normal deviate since a z-score will describe how much a point deviates from a mean or specification point.Why use a Process Sigma?
The process sigma is helpful in three ways:3 Days of Hands-On Training on User Experience Methods, Metrics and Analysis.Learn More
Identifying the 3 Types of Missing Data
10 Essential User Experience Methods
97 Things to Know about Usability
10 Things to Know about Usability Problems
Confidence Interval Calculator for a Completion Rate
Nine misconceptions about statistics and usability
How to Conduct a Usability test on a Mobile Device
What five users can tell you that 5000 cannot
The Five Most Influential Papers in Usability
Should you use 5 or 7 point scales?
A Brief History of the Magic Number 5 in Usability Testing
Why you only need to test with five users (explained)
Does better usability increase customer loyalty?
8 Ways to Show Design Changes Improved the User Experience
Quantifying the User Experience: Practical Statistics for User Research The most comprehensive statistical resource for UX Professionals Buy on Amazon | |
Excel & R Companion to Quantifying the User Experience Detailed Steps to Solve over 100 Examples and Exercises in the Excel Calculator and R Buy on Amazon | Download | |
A Practical Guide to the System Usability Scale Background, Benchmarks & Best Practices for the most popular usability questionnaire Buy on Amazon | Download | |
A Practical Guide to Measuring Usability 72 Answers to the Most Common Questions about Quantifying the Usability of Websites and Software Buy on Amazon | Download |