ind_gen {DAKS}R Documentation

Inductive Generation Procedure

Description

ind_gen generates inductively a set of competing quasi orders.

Usage

ind_gen(b)

Arguments

b a required matrix of the numbers of counterexamples for all pairs of items, for instance obtained from a call to ob_counter.

Value

If the argument b is of required type, ind_gen returns a list of the inductively generated quasi orders.

Note

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.'

Author(s)

Anatol Sargin anatol.sargin@math.uni-augsburg.de, Ali Uenlue ali.uenlue@math.uni-augsburg.de

References

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.

See Also

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.

Examples

ob <- ob_counter(pisa)
ind_gen(ob)

[Package DAKS version 2.0-0 Index]