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?
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Quantifying the User Experience 2nd Ed.: 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 |