Description Usage Arguments Details Value Note Author(s) References See Also Examples
ob_counter
computes from a dataset for all item pairs the
corresponding numbers of counterexamples.
1 | ob_counter(dataset)
|
dataset |
a required data frame or matrix consisting of binary, 1 or 0, numeric data. |
For an item pair (i, j), the number of subjects solving item j but failing to solve item i, is the corresponding number of counterexamples. Their response patterns contradict the interpretation of (i, j) as 'mastering item j implies mastering item i.'
The data must contain only ones and zeros, which encode solving or failing to solve an item, respectively.
If the argument dataset
is of required type,
ob_counter
returns a matrix of the numbers of counterexamples
for all pairs of items.
The function ind_gen
can be used to inductively generate from
the returned matrix of the numbers of counterexamples a set of quasi
orders.
The function iita
calls ob_counter
.
Anatol Sargin, Ali Uenlue
Sargin, A. and Uenlue, A. (2009) Inductive item tree analysis: Corrections, improvements, and comparisons. Mathematical Social Sciences, 58, 376–392.
Uenlue, A. and Sargin, A. (2010) DAKS: An R package for data analysis methods in knowledge space theory. Journal of Statistical Software, 37(2), 1–31. URL http://www.jstatsoft.org/v37/i02/.
ind_gen
for inductive generation procedure using
numbers of counterexamples; iita
, the interface that
provides the three inductive item tree analysis methods under one
umbrella. See also DAKS-package
for general
information about this package.
1 |
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.