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From |
Jared Saletin <jsaletin@berkeley.edu> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
re: st: Interaction of ANOVA contrast (e.g. linear/quadratic trend) and another Factor Variable? |

Date |
Thu, 5 May 2011 00:25:53 -0700 |

Dear David and Phil, Thanks so much for the help. I'll definitely look into desmat as per below. Would it be possibly correct (based on the example here: http://www.ats.ucla.edu/stat/Stata/examples/da/dastata7.htm), to do the below, in order to look at say linear(A) x B interaction Generate linear, quad and cubic coefficients for the factor a (3 levels), as per: generate linear = a generate quad = a recode linear 1 = -1 2 = 0 3 = 1 recode quad 1 = 1 2 = -2 3 = 1 and then load the anova model as the following: anova y c.linear c.quad b c.linear#b c.quad#b -- At least in this simple example, would that make sense? Will look into desmat as well as it undoubtedly will help for any designs more complicated than the above. ~Jared * * 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/

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