summary.din {CDM}  R Documentation 
Summary Method for Objects of Class din
Description
S3 method to summarize objects of the class din
.
Usage
## S3 method for class 'din'
summary(object, top.n.skill.classes=6, overwrite=FALSE, ...)
Arguments
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. 
Details
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’).
Value
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:
CALL 
A character specifying the model rule, the number of items and the number of attributes underlying the items. 
IDI 
A matrix giving the item discrimination
index (IDI; Lee, de la Torre & Park, 2012) for each item
where a high IDI corresponds to favorable test items which have both low guessing and slipping rates. 
SKILL.CLASSES 
A vector giving the 
AIC 
A numeric giving the AIC of the specified model

BIC 
A numeric giving the BIC of the specified model

log.file 
A character giving the path and file of a specified log file. 
din.object 
The object of class 
References
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, 333345.
Rupp, A. A., Templin, J. L., & Henson, R. A. (2010) Diagnostic Measurement: Theory, Methods, and Applications. New York: The Guilford Press.
See Also
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 CDMpackage
for general
information about this package.
Examples
##
## (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)