check.reliability {mokken} | R Documentation |
Returns a list of three reliability statistics: Molenaar Sijtsma (1984, 1988) statistic (a.k.a rho), Cronbach's (1951) alpha, and Guttman's (1945) lambda 2.
check.reliability(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 |
MS |
Molenaar Sijtsma statistic (a.k.a. rho). |
alpha |
Cronbach's alpha |
lambda.2 |
Lambda 2 |
L. A. van der Ark a.vdark@uvt.nl
Cronbach, L. (1951). Coefficient alpha and the internal structure of tests. Psychometrika, 16, 297-334.
Guttman, L. (1945). A basis for analyzing test-retest reliability. Psychometrika, 10,255-282.
Molenaar, I. W. and K. Sijtsma (1984). Internal consistency and reliability in Mokken's nonparametric item response model. Tijdschrift voor onderwijsresearch, 9, 257–268.
Molenaar, I. W. and K. Sijtsma (1988). Mokken's approach to reliability estimation extended to multicategory items. Kwantitatieve methoden, 9(28), 115-126.
Sijtsma, K. and I. W. Molenaar (1987). Reliability of test scores in nonparametric item response theory. Psychometrika, 52,79-97.
Van der Ark, L. A. (2007). Mokken scale analysis in R. Journal of Statistical Software. http://www.jstatsoft.org
Van der Ark, L. A. (2008). Computation of the Molenaar Sijtsma statistic. Manuscript submitted for publication
coefH
, check.iio
, check.monotonicity
, check.pmatrix
, check.restscore
data(acl) Communality <- acl[,1:10] check.reliability(Communality)