iarm (version 0.2.0)

partgam_LD: Partial Gamma to detect Local Dependence (LD)

Description

Rasch models assume locally independent items. There should be no substantial correlation left between two items once the underlying factor has been taken into account. Partial Gamma coefficients between pairs of items controlled for the rest score can be used to assess this requirement.

Usage

partgam_LD(dat.items)

Arguments

dat.items

A data frame with the responses to the items.

Value

data frame with Gamma coefficients, standard errors, p values and confidence limits for every pair of items.

References

Christensen, K. B. , Kreiner, S. & Mesbah, M. (Eds.) Rasch Models in Health. Iste and Wiley (2013), pp. 133 - 135.

See Also

partgam_DIF

Examples

# NOT RUN {
partgam_LD(amts[,4:13])
# }