check.pmatrix {mokken}R Documentation

Check of Nonintersection Using Method Pmatrix

Description

computes the P(++) and P(- -) matrix and auxiliary information

Usage

check.pmatrix(X, minvi = 0.03)

Arguments

X matrix or data frame of numeric data containing the responses of nrow(X) respondents to ncol(X) items. Missing values are not allowed
minvi minimum size of a violation that is reported

Details

The output is often numerous. Functions plot and summary can be used to summarize the output. See Van der Ark (2007) for an example.

Value

Ppp P(++) matrix
Pmm P(–) matrix
I.item vector indicating to which items the rows and column the P(++) matrix belong
I.step the labels of the item steps in order of popularity
I.labels the item labels
Hi the item scalability coefficients Hi
minvi the value of minvi

Author(s)

L. A. van der Ark a.vdark@uvt.nl

References

Mokken, R. J. (1971) A Theory and Procedure of Scale Analysis. Berlin, Germany: De Gruyter.

Molenaar, I.W. and Sijtsma, K. (2000) User's Manual MSP5 for Windows [Software manual]. Groningen, The Netherlands: IEC ProGAMMA.

Sijtsma, K, and Molenaar, I. W. (2002) Introduction to nonparametric item response theory. Thousand Oaks, CA: Sage.

Van der Ark, L. A. (2007). Mokken scale analysis in R. Journal of Statistical Software. http://www.jstatsoft.org

See Also

coefH, check.iio, check.monotonicity, check.restscore, check.reliability, plot.pmatrix.class, summary.pmatrix.class

Examples

data(acl)
Communality <- acl[,1:10]
pmatrix.list <- check.pmatrix(Communality)
plot(pmatrix.list)
summary(pmatrix.list)

[Package mokken version 1.4 Index]