mokken (version 2.7.7)

check.errors: Check the number of Guttman errors for each respondent

Description

Returns an integer vector with the number of Guttman errors (Guttman, 1944) for each respondent (e.g., Meijer, 1994; Mokken, 1971; Molenaar and Sijtsma, 2000; Sijtsma and Molenaar, 2002).

Usage

check.errors(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

Value

• Vector containing the number of Guttman errors for each respondent

References

Guttman, L. (1944) A basis for scaling qualitative data. American Sociological Review, 9, 139-150. Meijer, R. R. (1994) The number of Guttman errors as a simple and powerful person-fit statistic. Applied Psychological Measurement, 18, 311-314. 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/v20/i11

See Also

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

Examples

data(acl)
Communality <- acl[,1:10]
Guttman.errors <- check.errors(Communality)
hist(Guttman.errors, breaks = 0:max(Guttman.errors))