EffectStars2 (version 0.1-3)

effectstars.DIFboost: Plot effect stars for DIFboost objects.

Description

Plots effect stars for DIFboost-objects. The parameter estimates for DIF-items are plotted, grouped by items.

For more details on plotting effect stars see effectstars.

Usage

# S3 method for DIFboost
effectstars(x, only.DIFitems = TRUE, ...)

Arguments

x

A DIFboost-object.

only.DIFitems

If TRUE, only the estimates unequal to zero (estimates from the DIF-items) are visualized with EffectStars.

...

further arguments for generic function effectstars.

References

Schauberger, G. and Tutz, G. (2016): Detection of Differential Item Functioning in Rasch Models by Boosting Techniques, British Journal of Mathematical and Statistical Psychology, 69(1), 80 - 103 Tutz, G. and Schauberger, G. (2013): Visualization of Categorical Response Models - from Data Glyphs to Parameter Glyphs, Journal of Computational and Graphical Statistics 22(1), 156--177. Gerhard Tutz (2012): Regression for Categorical Data, Cambridge University Press

See Also

star.ctrl, effectstars

Examples

# NOT RUN {
### example for DIFboost

library(DIFboost)
data(simul.data)

Y <- simul.data[,1:10]
X <- simul.data[,11:13]

m1 <- DIFboost(Y = Y, X = X) 

effectstars(m1)

# }