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/
