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- Theses, studies, program evaluations, surveys, business data.
- Rather work it out yourself? Try the test chooser below.
Interactive guide
Which statistical test should I use?
Answer a few plain-language questions. You'll get a suggested test, what to check before you trust it, and links to free tools.
A starting point, not a substitute for looking at your data. Design details such as clustering, missing data, and multiple comparisons can change the right answer.
Free resources
Free tools and guides
These live on the DASS site and are free to use.
Tools
Power analysis calculators
Plan sample size for t-tests, ANOVA, correlations, chi-square, and multilevel designs.
Open calculators →APA 7 results formatters
Turn statistical output into clean, copy-ready APA sentences. Runs in your browser.
Open formatters →Check a reported p-value
Recompute the exact p from a t, F, chi-square, or correlation statistic and compare it to what was reported.
Check a p-value →Guides
Answers
Recent questions, answered
Plain-language answers to statistics questions people are asking.
Where should histogram bin edges go when your data are rounded?
When values are recorded to a fixed unit, put histogram bin edges halfway between the possible values. Here is why, and how counts differ.
Read the answer →Chi-square test with expected counts below 5: what should you do?
What the rule of 5 really checks, when sparse cells matter, and how Fisher's exact test or a Monte Carlo p value fixes 2x2 and larger tables.
Read the answer →How do you test whether event counts vary by month?
A chi-square goodness-of-fit test weighted by month length, its blind spots, and a Poisson regression that tests one seasonal wave on 2 df.
Read the answer →Need more than an answer?
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