CDM (version 4.991-1)

IRT.modelfit: S3 Methods for Assessing Model Fit

Description

This S3 method asesses global (absolute) model fit using the methods described in modelfit.cor.din.

Usage

IRT.modelfit(object, ...)
"IRT.modelfit"(object, ...)
"IRT.modelfit"(object, ...)
"summary"(object, ...)
"summary"(object, ...)

Arguments

object

Object of classes din or gdina.

...

More arguments to be passed.

Value

See output of modelfit.cor.din.

See Also

For extracting the individual likelihood or posterior see IRT.likelihood or IRT.posterior.

The model fit of objects of class gdm can be obtained by using the TAM::tam.modelfit.IRT function in the TAM package.

Examples

## Not run: 	
# #############################################################################
# # EXAMPLE 1: Absolute model fit
# #############################################################################
# data(sim.dina)
# data(sim.qmatrix)
# 
# #*** Model 1: DINA model for DINA simulated data
# mod1 <- din(sim.dina, q.matr = sim.qmatrix, rule = "DINA" )
# fmod1 <- IRT.modelfit( mod1 )
# summary(fmod1)
#   ##  Test of Global Model Fit
#   ##         type value     p
#   ##  1   max(X2) 8.728 0.113
#   ##  2 abs(fcor) 0.143 0.080
#   ##  
#   ##  Fit Statistics
#   ##                    est
#   ##  MADcor          0.030
#   ##  SRMSR           0.040
#   ##  100*MADRESIDCOV 0.671
#   ##  MADQ3           0.062
#   ##  MADaQ3          0.059
# 
# #*** Model 2: GDINA model
# mod2 <- gdina( sim.dina , q.matr = sim.qmatrix , rule="GDINA" )
# fmod2 <- IRT.modelfit( mod2 )
# summary(fmod2)
#   ##  Test of Global Model Fit
#   ##         type value p
#   ##  1   max(X2) 2.397 1
#   ##  2 abs(fcor) 0.078 1
#   ##  
#   ##  Fit Statistics
#   ##                    est
#   ##  MADcor          0.023
#   ##  SRMSR           0.030
#   ##  100*MADRESIDCOV 0.515
#   ##  MADQ3           0.075
#   ##  MADaQ3          0.071
# ## End(Not run)