st: Generate one score for 2+ factors?

[nola l <nola0908@gmail.com>]

I have a question on factor analysis. Please pardon me if it sounds
too silly. I am new to factor analysis.

When we run the factor analysis, normally we need to look at
eigenvalues and see how many factors we need to keep.  Here is my
results which suggested keep 2 factors.  Is there a program that can
sort of combine two factor into one score? I read from literature that
"the factors must first be generated using the Thompson's regression
method and then each must be multiplied with its own proportion of
variance explained" . Can we do that in Stata?

 k  |  Eigenvalues  |  Proportion explained  |  Cum. explained
----+---------------+------------------------+------------------
  1 |    1.763798   |    0.352760            |   0.352760
  2 |    1.312006   |    0.262401            |   0.615161
  3 |    0.941635   |    0.188327            |   0.803488
  4 |    0.592744   |    0.118549            |   0.922037
  5 |    0.389817   |    0.077963            |   1.000000

Any suggestion?

Thank,
Nola
*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/faqs/resources/statalist-faq/
*   http://www.ats.ucla.edu/stat/stata/