read.item.GGUM2004 | R Documentation |
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.
read.item.GGUM2004(temp.dir = "C:/GGUM2004/TEMPFILE", precision = 4)
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). |
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 != 0. |
Observe that this function is optimized for the Windows operating system because 'GGUM2004' is a Windows program.
Sebastian Castro-Alvarez, secastroal@gmail.com
Robertsetal2000GGUM
\insertRefRobertsetal2006GGUM
## Not run: # If the 'GGUM2004' output files are in the default directory # (C:/GGUM2004/TEMPFILE), then simply execute read.item.GGUM2004() ## End(Not run)
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