Afternoon R help, I want to run Rasch/IRT analyses using the ltm package, however, I am using large scale survey data which requires weighting for accurate results. I attempted to create a weighted object to insert into the formulae of the ltm packages, however, the survey data only includes 30 replicate weights and a sampling weight. The svrepdesign requires additional information such as jacknife weights in an external object (for scale, rscale), however, I do not have these. I typically just use the sampling weight when doing analyses in other platforms such as MPlus, however there does not appear to a way of referring to this directly in the ltm formulae.
My question is: am I able to insert sampling weights directly into an ltm analysis, or is there a way of creating a weighted data object with the information available which I could then insert into the ltm analyses? I have been unable to find any similar help topics using the websearch. Thanks. -- ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
