read.item.GGUM2004: Read 'GGUM2004' item estimates into R

In GGUM: Generalized Graded Unfolding Model

Read 'GGUM2004' item estimates into R

Description

read.item.GGUM2004 reads the output files from 'GGUM2004' with the item parameters. Both the item parameter estimates and their standard errors are imported into R.

Usage

read.item.GGUM2004(temp.dir = "C:/GGUM2004/TEMPFILE", precision = 4)

Arguments

temp.dir	The directory where 'GGUM2004' saved the output. By default, it is "C:/GGUM2004/TEMPFILE".
precision	Number of decimal places of the results (default = 4).

Value

read.item.GGUM2004 returns a list cointaning the following components:

alpha	The estimated discrimination parameters (for GGUM).
delta	The estimated difficulty parameters.
taus	The estimated threshold parameters.
alphaSE	The standard errors for the estimated discrimination parameters (for GGUM).
deltaSE	The standard errors for the estimated difficulty parameters.
tausSE	The standard errors for the estimated threshold parameters (above zero; recall that the threshold parameters are constrained to symmetry around zero, that is, \tau_{i(C+1)}=0 and \tau_{iz}=-\tau_{i(M-z+1)} for z\not= 0.

Details

Observe that this function is optimized for the Windows operating system because 'GGUM2004' is a Windows program.

Author(s)

Sebastian Castro-Alvarez, [e-mail]

References

\insertRef

Robertsetal2000GGUM

\insertRef

Robertsetal2006GGUM

Examples

## Not run: 
# If the 'GGUM2004' output files are in the default directory 
# (C:/GGUM2004/TEMPFILE), then simply execute
read.item.GGUM2004()

## End(Not run)

GGUM documentation built on Sept. 8, 2023, 5:38 p.m.