sirt (version 0.31-20)

data.read: Dataset Reading

Description

This dataset contains $N=328$ students and $I=12$ items measuring reading competence. All 12 items are arranged into 3 testlets (items with common text stimulus) labeled as A, B and C. The allocation of items to testlets is indicated by their variable names.

Usage

data(data.read)

format

A data frame with 328 persons on the following 12 variables. Rows correspond to persons and columns to items. The following items are included in data.read: Testlet A: A1, A2, A3, A4 Testlet B: B1, B2, B3, B4 Testlet C: C1, C2, C3, C4

Examples

data(data.read)
colMeans(data.read)

# estimation of the Rasch model with rasch.mml2
mod <- rasch.mml2( data.read )
summary(mod)