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st: RE: Comparing means of two variables using -suest-


From   "Martin Weiss" <martin.weiss1@gmx.de>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: Comparing means of two variables using -suest-
Date   Tue, 7 Oct 2008 11:13:03 +0200

Just out of curiosity. Why not: -proportion male female if participating ==
1 & pension == 1- and compare the resulting CIs? The -if- statement records
what is common to both groups, namely that they participate and that they
draw a pension.


HTH
Martin


-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Leonor Saravia
Sent: Tuesday, October 07, 2008 10:08 AM
To: statalist@hsphsun2.harvard.edu
Subject: st: Comparing means of two variables using -suest-

Hello,

IŽd like to compare two means of two different groups (dummy
variables), where each one is affected by a grouping variable. I was
looking in the Stata FAQS and found that this was posible with the -
suest - command, but when I use it, it doesnŽt work and I donŽt know
whatŽs wrong. IŽappreciate if you could give me some advice.

My dummy variables are like this:

act_m = (participating == 1 & male == 1) ; 0 otherwise
act_f =  (participating == 1 & female == 1) ; 0 otherwise
pension = 1 if recieves a pension; 0 otherwise

And I need to compare the 'act_m' mean when 'pension' == 1 with the
mean of 'act_f' when 'pension' == 1.

What I was doing was (and didnŽt work):

svyset folio [pw = factor]
mean act_m if (hm3_hym == 1 & menor15h == 1) [fw = factorex], over(pension)
est store act_m1
mean act_f if (hm3_hym == 1 & menor15h == 1) [fw = factorex], over(pension)
est sto act_f1
suest act_m1 act_f1,svy
test [act_m1]pensionh [act_h1]pensionh

The error that Stata brings is:

suest act_m1 act_h1,svy
unable to generate scores for model act_m1
suest requires that predict allow the score	option
r(322);


Well, IŽd appreciate very much your help! :)

Leonor





Thank you so much Austin!..... This has been very helpful... I appreciate it

Regards

Renato

On Feb 24 2008, Austin Nichols wrote:


Renato <ravi0023@umn.edu>:
Try -suest- e.g.

sysuse auto
svyset [pw=wei]
qui svy: reg len for
est sto length
qui svy: reg turn for
est sto turn
qui svy: reg tru for
est sto trunk
suest length turn trunk, svy
test [length]foreign [turn]foreign [trunk]foreign


On 23 Feb 2008 16:34:29 -0600,  <ravi0023@umn.edu> wrote:

I have a data base with 2 different test scores and two groups, a treatment
group and a control group. I have managed to test whether the mean of each
test scores is different among the two groups using svymean and then lincom
in this way:

svy: mean testA, over(treatment)
lincom [testA]1-[testA]0

svy: mean testB, over(treatment)
lincom [testB]1-[testB]0

What I want to do is jointly test whether both variables (testA and testB)
are jointly statistically different among the two groups, but incorporating
the sample design in my estimation.

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