iarm (version 0.1.2)

item_restscore: Item Restscore Association

Description

The observed Gamma coefficient between the score of a single item and the total score of the remaining items is compared with the corresponding expected Gamma coefficient under the Rasch model.

Usage

item_restscore(object)

Arguments

object

An object of class "Rm", a fitted Rasch model or partial credit model using the functions RM or PCM in package eRm, or an object of class "pcmodel", a fitted partial credit model using the function pcmodel in package psychotools.

Value

a matrix containing:

observed

observed gamma coefficients

expected

expected gamma coefficients

se

standard errors

pvalue

p values (under normal distribution assumption)

sig

significance stars: 0 " *** " 0.001 " ** " 0.01 " * " 0.05 " . " 0.1 " " 1

References

Kreiner, S. (2011). A note on item-restscore association in Rasch models. Applied Psychological Measurement, 35, 557-561.

Examples

# NOT RUN {
rm.mod <- RM(amts[,4:13])
item_restscore(rm.mod)
# }