Crosstab Atlas
Real tables. Reproducible results. Honest interpretation.
A growing reference library of contingency tables you can inspect, reproduce, and use to learn. Every example includes the source data, statistical test, effect size, assumptions, and the caveats that change what the numbers mean.
- Worked tables
- 8
- Primary-source records
- 6
- Labeled teaching tables
- 2
Browse the collection
Choose a question to investigate
Counts are reproduced from the cited source unless a card is explicitly marked illustrative.
Titanic Survival by Sex
Was survival on the Titanic associated with sex?
Sex by Outcome
Read the worked analysisTitanic Survival by Passenger Class
Was survival on the Titanic associated with passenger class?
Passenger class by Outcome
Read the worked analysisBerkeley Admissions by Sex (1973)
Were aggregate Berkeley admission decisions associated with sex?
Sex by Admission
Read the worked analysisSmoking and Lung Cancer (Doll & Hill, 1950)
Did smoking status differ between lung-cancer cases and controls?
Patient group by Smoking status
Read the worked analysisAspirin and Heart Attack (Physicians' Health Study)
Did low-dose aspirin reduce first heart attacks versus placebo?
Treatment by Myocardial infarction
Read the worked analysisSnoring and Heart Disease
Was snoring frequency associated with heart disease?
Snoring frequency by Heart disease
Read the worked analysisProduct Preference by Age Group
Does product preference differ by age group?
Age group by Preferred product
Read the worked analysisCustomer Churn by Billing Plan
Is customer churn associated with billing plan?
Billing plan by Outcome
Read the worked analysisHow the Atlas works
The data and the interpretation stay connected.
The figures on every page are recomputed by the same statistical engine used in the calculators. We show statistical significance alongside effect size, flag small-cell and study-design caveats, and link back to the original source so you can check the record.