A free book and tools for quantitative research
From a good question to a sound study
Plan your research before you collect a single number: what to measure, which statistical test fits, and how many participants you need.
- 25chapters of worked examples
- 46statistical tests in the selector
- Rbehind every analysis
How it works
Four steps, in the order research happens
Dream
Start with a question. Turn something you are curious about into a question that numbers can answer.
Learn
Read the book. See each method applied to real data, with the reasoning explained at every step.
Open the book →Design
Plan your study. Choose a test and work out your sample size before any data is collected.
Open the tools →Act
Run it and report. Carry out your analysis with confidence, then come back with the next question.
What is inside
A book that shows its work, and tools that do the arithmetic
The book · free to read online
Quantitative Research by Example
Each analysis is worked through on a real dataset, from checking assumptions to reporting the result. Notes in the margin add definitions and cautions without interrupting the text.
- Study design
- Effect size and power
- Assumptions
- t-Test
- ANOVA
- MANOVA
- Regression
- Logistic regression
Tool
Which test should I use?
Describe your variables and groups. Get the tests that fit, each with a short description.
Tool
How large a sample do I need?
Enter the values you know. The tool computes the one you leave empty: sample size, power, effect size or significance level.
In development
Guided research design
Step-by-step help designing your own study, from research question to analysis plan, with the R code and downloadable chapters for members.
Have a study in mind?
Begin with the chapter on design, or go straight to choosing your test.