Free tool · Data types

Variable & Data-Type Classifier

Name a variable, answer a question or two, and the tool works out its data type — then shows how to summarise it and the likely statistical test. Add each one to build a starter data dictionary.

Variable name

Its role in your study

Variable	Role	Type	Summarise with	Likely test family
No variables yet — classify one above and add it.

Getting the variable types right is what makes the analysis valid.
We help define variables, build the dictionary, and plan the analysis. Request advisory

v2.0 · last reviewed 2026-07. Method note: the type shown follows how the value behaves, not how it's coded — a category coded as a number (1=Medicine, 2=Surgery) is still categorical. The "likely test family" is an educational pointer based on the outcome's type; the final test also depends on design, number of groups, pairing, and distribution. Confirm with the Data Types lesson and a statistician.