"Robert J. MacG. Dawson" <[EMAIL PROTECTED]> wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> Can you do factor ananlysis, then? Probably yes. If the responses
> approximately line up in subspaces, that's a mathematical fact; you can
> do arithmetic on the responses. Once you've isolated the factors,
> though, it would seem reasonable to make inferences about the median,
> not about the mean. BUT, if the factor score distributions are roughly
> symmetric, this might be done using a t test!
Why a factor analysis and not a principal components analysis? I've been
taught
that a principal components analysis makes fewer assumptions on the data, so
assuming that one can perform a factor analysis then automatically one can
also perform a principal components analysis.
I think I have a preference for orthogonal rotations.
cheers
Michelle
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