Power analysis calculators
Estimate sample size for t-tests, ANOVA, correlations, chi-square, and multilevel designs.
Open calculatorsFREE TOOLS FOR DOCTORAL RESEARCH
Useful answers.
No paywall.
Plan your sample, check your statistics, and turn results into clear APA-style reporting. These free tools and guides can help you move through common dissertation decisions with more confidence.
Explore the free toolsBROWSER-BASED TOOLS
Run the check.
See the reasoning.
Free to use on the DASS and AskStats websites.
No software installation required.
APA 7 results formatters
Turn statistical output into clean, copy-ready APA sentences directly in your browser.
Open formattersCheck a reported p-value
Recompute the exact p from a t, F, chi-square, or correlation statistic and compare it with the reported value.
Check a p-valueNOT SURE WHICH TEST FITS?
Use the plain-language test chooser.
Answer a few questions about your goal and variables to get a suggested statistical test, assumptions to check, and links to related tools.
PRACTICAL GUIDES
Read before your
next decision.
Clear explanations for recurring questions in doctoral research.
DATA PREPARATIONThe Data Audit Checklist to Run First↗MISSING DATAFIML vs. Multiple Imputation: Which Should You Use?↗COMMITTEE FEEDBACKWhat to Do When a Reviewer Challenges Your Model↗STUDY DESIGNWhy Power for Cluster-Randomized Trials Isn't Simple↗PLANNING SUPPORTHow Much Does a Statistical Consultant Cost?↗
WHEN A TOOL ISN'T ENOUGH
Bring the context.
We'll work through it.
A calculator can give you a number. A consultation can help you decide whether the calculation fits your research question, design, data, and committee expectations.
Book a free consultation