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by James R Lewis, Jeff Sauro
Quantifying the User Experience, 2nd Edition
Cover
Title page
Table of Contents
Copyright
Dedication
Biographies
Foreword
Preface to the Second Edition
Acknowledgments
Chapter 1: Introduction and how to use this book
Abstract
Introduction
The organization of this book
How to use this book
Key points
Chapter review questions
Answers to chapter review questions
Chapter 2: Quantifying user research
Abstract
What is user research?
Data from user research
Usability testing
A/B testing
Survey data
Requirements gathering
Key points
Chapter 3: How precise are our estimates? Confidence intervals
Abstract
Introduction
Confidence interval for a completion rate
Confidence interval for rating scales and other continuous data
Key points
Chapter review questions
Answers to chapter review questions
Chapter 4: Did we meet or exceed our goal?
Abstract
Introduction
One-tailed and two-tailed tests
Comparing a completion rate to a benchmark
Comparing a satisfaction score to a benchmark
Comparing a task time to a benchmark
Key points
Chapter review questions
Answers to chapter review questions
Chapter 5: Is there a statistical difference between designs?
Abstract
Introduction
Comparing two means (rating scales and task times)
Comparing completion rates, conversion rates, and A/B testing
Key points
Chapter review questions
Answers to chapter review questions
Chapter 6: What sample sizes do we need? Part 1: summative studies
Abstract
Introduction
Estimating values
Comparing values
What can I do to control variability?
Sample size estimation for binomial confidence intervals
Sample size estimation for chi-squared tests (independent proportions)
Sample size estimation for McNemar Exact Tests (matched proportions)
Key points
Chapter review questions
Answers to chapter review questions
Chapter 7: What sample sizes do we need? Part 2: formative studies
Abstract
Introduction
Using a probabilistic model of problem discovery to estimate sample sizes for formative user research
Assumptions of the binomial probability model
Additional applications of the model
What affects the value of p?
What is a reasonable problem discovery goal?
Reconciling the “Magic Number Five” with “Eight is Not Enough”
More about the binomial probability formula and its small-sample adjustment
Other statistical models for problem discovery
Key points
Chapter review questions
Answers to chapter review questions
Chapter 8: Standardized usability questionnaires
Abstract
Introduction
Post-study questionnaires
Post-task questionnaires
Questionnaires for assessing perceived usability of websites
Other questionnaires of interest
Key points
Chapter review questions
Answers to chapter review questions
Chapter 9: Six enduring controversies in measurement and statistics
Abstract
Introduction
Is it OK to average data from multipoint scales?
Do you need to test at least 30 users?
Should you always conduct a two-tailed test?
Can you reject the null hypothesis when p > 0.05? > 0.05?
Can you combine usability metrics into single scores?
What if you need to run more than one test?
Key points
Chapter review questions
Answers to chapter review questions
Chapter 10: An introduction to correlation, regression, and ANOVA
Abstract
Introduction
Correlation
Coefficient of determination (R2)
Regression
Analysis of variance
Key points
Chapter review questions
Answers to chapter review questions
Appendix: derivation of sample size formulas for regression
Chapter 11: Wrapping up
Abstract
Introduction
Getting more information
Good luck!
Key points
Appendix: A crash course in fundamental statistical concepts
Subject Index
Search in book...
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