[R] PCA with random effects

[Bert Gunter]

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 <dsidhu using 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
>
>
>
>
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