This is a statistical question, which is typically off topic here. This list is primarily concerned with R programming questions, although the two areas sometimes do intersect. I suggest you post on a statistical list such as stats.stackexchange.com instead, especially if you do not get a useful reply here.
Cheers, Bert 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 Mon, Apr 2, 2018 at 3:43 PM, David Sidhu <dsi...@ucalgary.ca> wrote: > I have the results of a rating study in which ~30 participants rated a subset > of 20 items on 25 different dimensions. > > I would like to perform PCA on these ratings to reduce the 25 different > dimensions. However, instead of doing this on the mean ratings for each > item, I would like to perform the PCA at the level of individual ratings. I > am assuming that in order to do this I have to specify the fact that ratings > are nested within participants and within items (i.e., crossed random > effects for subjects and items). Is this possible? > > --- > David M. Sidhu, MSc<http://davidmsidhu.com/> > PhD Candidate > Department of Psychology > University of Calgary > > > > > > > > [[alternative HTML version deleted]] > > ______________________________________________ > 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.
