coefH {mokken} | R Documentation |
Computes item-pair scalability coefficents Hij, item scalability coefficents Hi, and scale scalability coefficent H
coefH(X)
X |
matrix or data frame of numeric data
containing the responses of nrow(X) respondents to ncol(X) items.
Missing values are not allowed |
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.
Hij |
matrix containing scalability coefficients of the item pairs |
Hi |
vector containing scalability coefficients of the items |
H |
scalability coefficient of the entire scale |
L. A. van der Ark a.vdark@uvt.nl
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
data(acl) Communality <- acl[,1:10] coefH(Communality)