New York air quality
153 daily records, six variables, missing ozone and solar readings, and an instructive multiple regression. Inspect the collection before fitting anything.
Open the field notebook →
Evidence before equations
Data laboratory
Real statistical work begins by finding out what the records measure, where they came from, which values are missing, and what an analysis would actually describe.
Early release: The first fully documented exercise uses historical New York environmental measurements already distributed with R. The dataset is accessed through R, not copied or relicensed by this website.
Kidney-stone treatments
Published aggregate outcomes demonstrate why pooled success percentages can reverse their ordering inside relevant subgroups.
Examine the paradox →
Write the analysis
Run the supplied base-R scripts on your device, inspect the results, or write your own. No account or remote computation service is needed.
Open R Workbench →