How to obtain attribute estimates from estQ()

[cwliu007]

Hello Pablo,

I wonder if it is possible to return the attribute estimates from estQ()? I think it is possible. It will be most appreciated if you could let me know how to do it.

Many thanks for the useful package!

CW

[Pablo-Najera]

Hi!

The function estQ only provides an empirically estimated Q-matrix from the data. The suggested Q-matrix can be then used to estimate a model (e.g., G-DINA), from which attribute estimates can be retrieved. The following toy code illustrates how to do it using both the cdmTools and GDINA packages:

library(cdmTools)
library(GDINA)
dat <- GDINA::sim30GDINA$simdat # Illustrative dataset
Q <- cdmTools::estQ(dat, K = 5) # Empirical Q-matrix estimation
fit <- GDINA::GDINA(dat, Q$est.Q, model = "GDINA") # Fit a G-DINA model using the estimated Q-matrix
GDINA::personparm(fit) # Obtain the attribute profile classifications

Hope this helps. Thank you for using the package and for asking!

Pablo

[cwliu007]

I appreciate your insightful reply. Thank you!