coefH {mokken}R Documentation

Scalability coefficents H

Description

Computes item-pair scalability coefficents Hij, item scalability coefficents Hi, and scale scalability coefficent H

Usage

coefH(X)

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

Details

Does not work if any of the item variances equals zero. Such items should not be used in a test and removed from the data frame.

Value

Hij matrix containing scalability coefficients of the item pairs
Hi vector containing scalability coefficients of the items
H scalability coefficient of the entire scale

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

coefZ, search.normal

Examples

data(acl)
Communality <- acl[,1:10]
coefH(Communality)

[Package mokken version 1.4 Index]