coefZ {mokken} | R Documentation |
Computes Zij-values of item pairs, Zi-values of items, and Z-value of the entire scale, which are used to test whether Hij, Hi, and H, respectively, are significantly greater than zero.
Used in the function search.normal
coefZ(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 |
Zij |
matrix containing the z-values of the item-pairs |
Zi |
vector containing z-values of the items |
Z |
real z-value 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.
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) coefZ(Communality)