| check.pmatrix {mokken} | R Documentation |
Check of Nonintersection Using Method Pmatrix
Description
Returns a list (of class pmatrix.class) with results from the investigation of nonintersection using method pmatrix (Mokken, 1971; Molenaar & Sijtsma, 2000; Sijtsma & Molenaar, 2002).
Usage
check.pmatrix(X, minvi = 0.03)
Arguments
X |
matrix or data frame of numeric data
containing the responses of |
minvi |
minimum size of a violation that is reported |
Details
The output is often numerous.
Functions plot and summary can be used to summarize the output.
See Van der Ark (2007) for an example.
Value
results |
A list with as many components as there are item pairs. Each component itself is also a list containing the results of the check of nonintersection using Method pmatrix. The P(++) matrix and P(- -) (Molenaar & Sijtsma, 2000; Sijtsma & Molenaar, 2002) are also included. |
I.item |
vector indicating to which items the rows and column the P(++) matrix belong |
I.step |
the labels of the item steps in order of popularity |
I.labels |
the item labels |
Hi |
the item scalability coefficients Hi |
minvi |
the value of minvi |
Author(s)
L. A. van der Ark L.A.vanderArk@uva.nl
References
Mokken, R. J. (1971) A Theory and Procedure of Scale Analysis. De Gruyter.
Molenaar, I.W., & Sijtsma, K. (2000) User's Manual MSP5 for Windows [Software manual]. IEC ProGAMMA.
Sijtsma, K., & Molenaar, I. W. (2002) Introduction to nonparametric item response theory. Sage.
Van der Ark, L. A. (2007). Mokken scale analysis in R. Journal of Statistical Software. doi:10.18637/jss.v048.i05
See Also
check.errors,
check.iio,
check.monotonicity,
check.reliability
check.restscore,
coefH,
plot.pmatrix.class,
summary.pmatrix.class
Examples
data(acl)
Communality <- acl[,1:10]
pmatrix.list <- check.pmatrix(Communality)
plot(pmatrix.list)
summary(pmatrix.list)