Description Usage Arguments Author(s) References See Also Examples
A plotting routine producing non-parametric analogues of
the IRF not unlike those in Jim Ramsay's TestGraf
program. The curves are produced by a kernel binomial
regression of the actual responses to an item on some
estimates of the latent variable, by courtesy of package
sm
.
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resp |
A matrix of responses: persons as rows, items as columns, entries are either 0 or 1, no missing data |
x |
The values of the latent variable ("ability")
for the same persons whose responses are given in
|
items |
An index to the items (columns of
|
from |
Lower limit for ability on the plot. Default is -4. |
to |
Upper limit for ability on the plot. Default is 4. |
add |
When |
main |
The main title of the plot, given that
|
co |
The colour of the curves. Default is 1 for
black. Use |
bands |
When |
label |
When |
Ivailo Partchev
James O. Ramsay (2000). TestGraf: A program for the graphical analysis of multiple choice test and questionnaire data. McGill University, Montreal, Canada
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