Rasch model

The Rasch model is a probabilistic model used in psychometrics for measuring latent traits, such as abilities or attitudes. Developed by Danish mathematician Georg Rasch in the 1960s, the model is part of Item Response Theory (IRT). ### Key Features of the Rasch Model: 1. **Unidimensionality**: The Rasch model assumes that there is a single underlying trait (latent variable) that influences the responses.