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From |
"Hoang Thanh Huong(Yahoo)" <[email protected]> |

To |
<[email protected]> |

Subject |
st: weight and aggregate |

Date |
Sun, 15 Aug 2004 08:23:42 +0700 |

Hi all, Anybody has this problem: - I have a variable on household income (at household level) -I have weight at household level. Now I want to calculate income of all houshols with weight. But how should I do? Appreciate your help! Best, Huong ---- Original Message ----- From: "tmmanini" <[email protected]> To: <[email protected]> Sent: Sunday, August 15, 2004 5:04 AM Subject: st: ancova for repeated designs > I'm trying to run a supposed simple ancova model, controlling for pre-test > values. subjects are placed > in three groups and then tested at three different time points. I would like > to covary for the first time > point, examine the group*covariate interaction and calculate the adjusted > means. I've listed 10 > subjects (I really have 32) below (g=group, t=time, y=depvar, x=covariate). g > is a between factor, t is a > repeated factor. > > id g t y x > 1 1 1 1 1 > 1 1 2 1 1 > 1 1 3 1 1 > 3 2 1 1 1 > 3 2 2 1 1 > 3 2 3 1 1 > 4 3 1 5 5 > 4 3 2 5 5 > 4 3 3 1 5 > 6 2 1 5 5 > 6 2 2 4 5 > 6 2 3 1 5 > 7 3 1 6 6 > 7 3 3 6 6 > 7 3 2 6 6 > 8 1 1 3 3 > 8 1 2 3 3 > 8 1 3 3 3 > 9 1 1 6 6 > 9 1 2 6 6 > 9 1 3 6 6 > 10 1 1 1 1 > 10 1 2 1 1 > 10 1 3 1 1 > > When I run this with the 10 subjects listed above, I can't get the interaction > term b/c the df=0 (see > below) > > anova y x g / id | g t g*t x*g, cont(x) rep(t) > > Number of obs = 24 R-squared = 0.9126 > Root MSE = .983192 Adj R-squared = 0.7990 > > Source Partial SS df MS F Prob > F > -----------+---------------------------------------------------- > Model 100.958333 13 7.76602564 8.03 0.0012 > > x 37.5 1 37.5 25.05 0.0075 > g 2.98197901 2 1.4909895 1.00 0.4457 > idg 5.98844884 4 1.49711221 > -----------+---------------------------------------------------- > t 7.6 2 3.8 3.93 0.0550 > g*t 4.91666667 4 1.22916667 1.27 0.3437 > x*g 0 0 > > Residual 9.66666667 10 .966666667 > -----------+---------------------------------------------------- > Total 110.625 23 4.80978261 > > > when I try the adjust command, I come up with blanks (below) > > adjust x, by(g t) > > Dependent variable: y Command: anova > Variable left as is: id > Covariate set to mean: x = 3.5 > > t > g 1 2 3 > > 1 > 2 > 3 > > What is really annoying is the fact that I can use this same design in SPSS > and not have a problem, but I > would really like to use STATA. I've examined all the material on the > listserv I can find about this topic, > which has lead me to this point, but if you have another resource please point > me in the right direction. > > > > * > * For searches and help try: > * http://www.stata.com/support/faqs/res/findit.html > * http://www.stata.com/support/statalist/faq > * http://www.ats.ucla.edu/stat/stata/ > > * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**st: Re: weight and aggregate***From:*"R.E. De Hoyos" <[email protected]>

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