qmatrix_fractions: Expert Derived Q Matrix for Fractions Data

Description Usage Format References


Expert Derived Q Matrix for Fractions Data




A matrix with dimensions J = 20 (Items/rows) and K = 8 (Trait/columns). Each entry in the matrix is either 1, if the Item uses the Trait, or 0, if the Item does not use the Trait. The traits identified by this matrix are:

The subjects answered the following assessment items:


Tatsuoka, C. (2002), Data analytic methods for latent partially ordered classification models. Journal of the Royal Statistical Society: Series C (Applied Statistics), 51: 337–350. doi:10.1111/1467-9876.00272

Tatsuoka, K. K. (1984), Analysis of errors in fraction addition and subtraction problems (Final Report for Grant No. NIE-G-81-0002). Urbana: University of Illinois, Computer-Based Education Research Laboratory (CERL).

tmsalab/ecdmdata documentation built on Nov. 12, 2019, 12:09 a.m.