as.poly.mod {plink} | R Documentation |
This function attempts to turn the given values into a poly.mod object
as.poly.mod(n, model = "drm", items = NULL)
n |
total number of items |
model |
character vector identifying the IRT models used to estimate
the item parameters. The only acceptable models are
drm, gpcm, grm, mcm, and nrm . See below for an explantion of
the codes. |
items |
list identifying the item numbers from a set of parameters
that correspond to the given model in model . |
If all the items are dichotomous, it is only necessary to specify a value for n
.
If all the items correspond to a single model (other than drm
), only n
and model
need to be specified.
The IRT models associted with the codes:
drm
:gpcm
:grm
:mcm
:nrm
:
Returns an object of class poly.mod
Jonathan P. Weeks weeksjp@gmail.com
# Ten dichotomous items as.poly.mod(10) # The first ten items in the set of associated (not present here) item parameters # are dichotomous and the last five were estimated using the generalized # partial credit model as.poly.mod(15, c("drm", "gpcm"), list(1:10,11:15) )