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st: STATA Wish List, interactions


From   "Mitchell, Michael" <mnm@ucla.edu>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: STATA Wish List, interactions
Date   Thu, 21 Oct 2004 09:52:37 -0700

Greetings
  Sorry to jump in the middle of a conversation, but Tim Wade mentioned
a wish about being able to create interaction terms and mentioned
"desmat" for doing this.  I also wanted to make a pitch for "xi3" for
doing this and then "postgr3" for graphing the predicted values
afterwards. 
  A quick rundown about "xi3" can be found at
http://www.ats.ucla.edu/stat/stata/faq/xi3.htm with more at
http://www.ats.ucla.edu/stat/stata/webbooks/reg/chapter5/statareg5.htm .
  Information on "postgr3" can be found at
http://www.ats.ucla.edu/stat/stata/ado/analysis/postgr3.htm and an
example showing graphing a continuous by continuous interaction can be
found at http://www.ats.ucla.edu/stat/stata/code/graph_concon_int.htm .
But, please read the help file for "postgr3" and note its limitations.
  As always, all visitors are welcome to our Stata Resources page at
http://www.ats.ucla.edu/stat/stata/ and our Stata Portal at
http://statcomp.ats.ucla.edu/stata/default.htm .

Happy computing,

Michael Mitchell
Statistical Consulting Group
UCLA Academic Technology Services
http://www.ats.ucla.edu/stat/ 


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