ind_gen {DAKS} | R Documentation |
ind_gen
generates inductively a set of competing quasi
orders.
ind_gen(b)
b |
a required matrix of the numbers of counterexamples for all
pairs of items, for instance obtained from a call to
ob_counter . |
If the argument b
is of required type, ind_gen
returns
a list of the inductively generated quasi orders.
The function iita
calls ind_gen
for
constructing the set of competing quasi orders according to the
inductive generation procedure.
The set of competing quasi orders is a list of objects of the class
set
. These objects (quasi orders) consist of
2-tuples (i, j) of the class tuple
,
where a 2-tuple (i, j) is interpreted as `mastering item
j implies mastering item i.'
Anatol Sargin anatol.sargin@math.uni-augsburg.de, Ali Uenlue ali.uenlue@math.uni-augsburg.de
Sargin, A. and Uenlue, A. (2009) Inductive item tree analysis: Corrections, improvements, and comparisons. Manuscript under revision. http://www.math.uni-augsburg.de/~uenlueal/
Sargin, A. and Uenlue, A. (2009) DAKS: An R package for data analysis in knowledge space theory. Manuscript submitted for publication. http://www.math.uni-augsburg.de/~uenlueal/
Schrepp, M. (1999) On the empirical construction of implications between bi-valued test items. Mathematical Social Sciences, 38, 361–375.
Schrepp, M. (2003) A method for the analysis of hierarchical dependencies between items of a questionnaire. Methods of Psychological Research, 19, 43–79.
ob_counter
for computation of 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.
ob <- ob_counter(pisa) ind_gen(ob)