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| From | Richard Williams <Richard.A.Williams.5@ND.edu> |
| To | "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>, "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu> |
| Subject | re: st: effect coding with interaction variables |
| Date | Wed, 10 Mar 2010 08:46:20 -0500 |
At 07:57 AM 3/10/2010, Airey, David C wrote:
.Phil Ender has written "anovalator" which gets you interaction tests from indicator coded regression _as if_ you had used effect coding (http://www.ats.ucla.edu/stat/stata/faq/anovalator.htm). Especially, see the FAQ on use of the margins command here, if you are using Stata 11 (http://www.ats.ucla.edu/stat/stata/faq/default.htm).
This sounds good. Perhaps some future version of Stata will allow effect coding in addition to the current 0/1 coding you get with the i.xvar notation. Mitchell & Ender's -xi3- command (available from UCLA) has a lot of nice coding options that can sometimes be helpful.
------------------------------------------- Richard Williams, Notre Dame Dept of Sociology OFFICE: (574)631-6668, (574)631-6463 HOME: (574)289-5227 EMAIL: Richard.A.Williams.5@ND.Edu WWW: http://www.nd.edu/~rwilliam * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/