I am new in STATA and I need somme help to perform MCA and cluster of
variables.
I would like to perform a MCA (Multiple Correspondence Analysis) with Stata 7.
I tried to compare different qualitative variables with two, three or four
modalities.
I used the command mca. I did the same analysis with another data analysis
software "SPAD". Then I compared the results of the two different software
to check Stata 7 results. The results were quite the same for data like
coordinates, contributions of principal axis, explained inertia of axes,
given approximately the same representation. However, the values of the
principal inertia component were completely different.
Stata results for Inertia were very strange. These results were :
With Stata the first axis was enough to explain the variables relations but
with SPAD, 5 axis were necessary to explain 88.79% of the variables relations!
Where does the problem come from? Can someone help me and say me if Stata 7
is a good software for MCA?
To check the MCA results, I would like to perform a cluster analysis which
would compare distance between variables, more precisely between variables
modalities. The problem is that I did not find how to perform a cluster
analysis between variables on Stata 7. I only found how performing an
analysis between the observations. I don't know if this kind of analysis is
possible on Stata7, is it?