Usage
tam.jml(resp, group = NULL, disattenuate = FALSE, bias = TRUE,
xsi.fixed = NULL, xsi.inits = NULL, A = NULL, B = NULL, Q = NULL,
R = NULL, ndim = 1, pweights = NULL, control = list())
tam.jml2(resp, group = NULL, disattenuate = FALSE, bias = TRUE,
xsi.fixed = NULL, xsi.inits = NULL, A = NULL, B = NULL, Q = NULL,
R = NULL, ndim = 1, pweights = NULL, control = list())Arguments
resp
A matrix of item responses. Missing responses must be declared
as NA.
group
An optional vector of group identifier
disattenuate
Should the person parameters disattenuated due to
unreliability? The disattenuation is conducted by applying
the Kelley formula.
bias
A logical which indicates if JML bias shold be reduced
by multiplying item parameters by the adjustment factor
of $(I-1)/I$
xsi.fixed
An optional matrix with two columns for fixing some of the
basis parameters $\xi$ of item intercepts.
1st column: Index of $\xi$ parameter, 2nd column:
Fixed value of $\xi$ parameter
xsi.inits
An optional vector of initial $\xi$ parameters
A
A design array $A$ for item category intercepts.
For item $i$ and category $k$, the threshold is
specified is $\sum _j a_{ikj} \xi_j$.
B
A design array for scoring item category responses.
Entries in $B$ represent item loadings on
abilities $\theta$.
Q
A $Q$ matrix which defines loadings of items on dimensions.
R
This argument is not yet used.
ndim
Number of dimensions in the model. The default is 1.
pweights
An optional vector of person weights.
control
A list of control arguments. See tam
for more details.