OK thanks for the guidance Rob > On 7 Jun 2020, at 16:15, Bert Gunter <bgunter.4...@gmail.com> wrote: > > ⚠ External sender. Take care when opening links or attachments. Do not > provide your login details. > Such package/methodology specific questions may well go unanswered here. They > are essentially offtopic anyway: this list is about general R programming > questions and cannot be expected to support the ~ 20000 packages now in the > ecosystem. I suggest that you contact the package maintainer (?maintainer) > for help or to find out what support resources may be available. > > Bert Gunter > > "The trouble with having an open mind is that people keep coming along and > sticking things into it." > -- Opus (aka Berkeley Breathed in his "Bloom County" comic strip ) > > > On Sun, Jun 7, 2020 at 3:59 AM Rob Forsyth <rob.fors...@newcastle.ac.uk> > wrote: > I am using the eRm package to examine the properties of a clinical rating > scale using a Partial Credit Model (PCM). I understand how to extract the > person ability estimates (thetas) from a simple fitted PCM but I have a > dataset with repeated observations over time (~1200 observations of the > instrument in ~250 individuals). So as not to violate assumptions of > conditional independence I've fitted the PCM to single observations drawn at > random from each subject. This works but I would now like to use the item > diffculty estimates from the fitted PCM to generate person-ability estimates > for the remaining ~950 observations (at other timepoints) not used to fit the > model; and I can't see from the eRm package documentation how to do this? > > Advice very much appreciated > Rob > ______________________________________________ > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > 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.
______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.
