Dear Ulrich,
Thanks for your reply. I now have more confidence in analyzing my data
with PCA. However, you mentioned that 43 subjects are too thin to obtain
a stable/converge result. This incurs me another question -- how many
subjects are enough to obtain a stable result, if the same set of
stimuli are rated by a 5-point scale? 50? (supposed that each rating
point needs 10 subjects.)
> But here are some weaknesses. If you have 11 or 17 stimuli, it would
> be nice to have 110 or 170 subjects in order to have a stable
> structure, by the usual rule of thumb. 43? Pretty thin.
Wen-Feng
===========================================================================
This list is open to everyone. Occasionally, less thoughtful
people send inappropriate messages. Please DO NOT COMPLAIN TO
THE POSTMASTER about these messages because the postmaster has no
way of controlling them, and excessive complaints will result in
termination of the list.
For information about this list, including information about the
problem of inappropriate messages and information about how to
unsubscribe, please see the web page at
http://jse.stat.ncsu.edu/
===========================================================================
