summary.din.Rd
S3 method to summarize objects of the class din
.
# S3 method for din summary(object, top.n.skill.classes=6, overwrite=FALSE, ...)
object | A required object of class |
---|---|
top.n.skill.classes | A numeric, specifying the number of skill classes, starting with the most frequent, to be returned. Default value is 6. |
overwrite | An optional boolean, specifying wether or not
the method is supposed to overwrite an existing |
... | Optional parameters to be passed to or from other methods will be ignored. |
The function summary.din
returns an object of the class
summary.din
(see ‘Value’), for which a
print
method, print.summary.din
, is
provided. Specific summary information details such as
individual item parameters and their discrimination indices
can be accessed through assignment (see ‘Examples’).
If the argument object
is of required type,
summary.din
returns a named list, of the class
summary.din
, consisting of the following seven components:
A character specifying the model rule, the number of items and the number of attributes underlying the items.
A matrix giving the item discrimination index (IDI; Lee, de la Torre & Park, 2012) for each item \(j\) $$ IDI_j=1 - s_j - g_j, $$ where a high IDI corresponds to favorable test items which have both low guessing and slipping rates.
A vector giving the top.n.skill.classes
most frequent skill classes and the corresponding class probability.
A numeric giving the AIC of the specified model
object
.
A numeric giving the BIC of the specified model
object
.
A character giving the path and file of a specified log file.
The object of class din
for which the summary
was requested.
Lee, Y.-S., de la Torre, J., & Park, Y. S. (2012). Relationships between cognitive diagnosis, CTT, and IRT indices: An empirical investigation. Asia Pacific Educational Research, 13, 333-345.
Rupp, A. A., Templin, J. L., & Henson, R. A. (2010) Diagnostic Measurement: Theory, Methods, and Applications. New York: The Guilford Press.
plot.din
, the S3 method for plotting objects of
the class din
; print.din
, the S3 method
for printing objects of the class din
;
summary.din
, the S3 method for summarizing objects
of the class din
, which creates objects of the class
summary.din
; din
, the main function for
DINA and DINO parameter estimation, which creates objects of the class
din
. See also CDM-package
for general
information about this package.
## ## (1) examples based on dataset fractions.subtraction.data ## ## Parameter estimation of DINA model # rule="DINA" is default fractions.dina <- CDM::din(data=CDM::fraction.subtraction.data, q.matrix=CDM::fraction.subtraction.qmatrix, rule="DINA") ## corresponding summaries, including diagnostic accuracies, ## most frequent skill classes and information ## criteria AIC and BIC summary(fractions.dina) ## In particular, accessing detailed summary through assignment detailed.summary.fs <- summary(fractions.dina) str(detailed.summary.fs)