Guides · Overview
Learn
Rasch analysis, from zero
Rasch measurement has a reputation for dense notation and denser software manuals. The ideas underneath are simple and physical — people and questions on the same ruler. These guides build that intuition with things you can drag, then connect each idea to the analysis you’ll actually run.
Start here
What is Rasch measurement?
The one-equation model that turns right/wrong answers into a ruler — with an interactive curve you can drag.
Your first analysis in Logit
From a CSV of responses to a Wright map, fit table, and report — a ten-minute walkthrough of the whole workflow.
Guides & walkthroughs
Reading a Wright map
People and items on one ruler: targeting, gaps, and what a good item spread looks like.
Understanding fit statistics
Infit, outfit, and what 'the data misfit the model' actually tells you — plus the folklore cutoffs and their limits.
Rating scales & category structure
Thresholds, category curves, and how to spot a middle category that isn't doing its job. Interactive.
Walkthrough: Liking for Science
Replicate the textbook Rating Scale Analysis example (Wright & Masters, 1982) end-to-end in Logit — and check the numbers against the published calibration.
Wondering whether you can trust the numbers behind these demos? See how the engine is validated against published calibrations.