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Re: st: crude binary analysis


From   Steven Samuels <sjhsamuels@earthlink.net>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: crude binary analysis
Date   Sun, 24 Aug 2008 14:54:36 -0400

Sahid-

You asked for a version of a survey program which would match the results in -tabodd-. -tabodd- has no line with a "reference group" and an entry of 1. Nor does it give odds ratios (OR's) as I stated in my email. So, exactly what question did you mean to ask?

-Steve



On Aug 24, 2008, at 2:46 PM, Sahid Hocine wrote:


Thanks,
In addition when i do perform the following i have a problem since
the or for the first line should be 1 as reference? Sahid

. xi,noomit:svy:logit sd107 i.v130,nocons or

(running logit on estimation sample)



Survey: Logistic regression



Number of strata = 35 Number of obs = 5600

Number of PSUs = 4823 Population size = 5638.5227

Design df = 4788

F( 2, 4787) = 510.77

Prob > F = 0.0000



---------------------------------------------------------------------- --------

| Linearized

sd107 | Odds Ratio Std. Err. t P>|t| [95% Conf. Interval]

------------- +----------------------------------------------------------------

_Iv130_1 | .016556 .0021707 -31.28 0.000 . 0128034 .0214084

_Iv130_2 | .0087124 .0062621 -6.60 0.000 . 002129 .0356531

---------------------------------------------------------------------- --------

On Sun, Aug 24, 2008 at 7:43 PM, Sahid Hocine <cahid2@googlemail.com> wrote:


Thanks,
In addition when i do perform the following i have a problem since the or for the first line should be 1 as reference? Sahid

. xi,noomit:svy:logit sd107 i.v130,nocons or

(running logit on estimation sample)



Survey: Logistic regression



Number of strata = 35 Number of obs = 5600

Number of PSUs = 4823 Population size = 5638.5227

Design df = 4788

F( 2, 4787) = 510.77

Prob > F = 0.0000



--------------------------------------------------------------------- ---------

| Linearized

sd107 | Odds Ratio Std. Err. t P>|t| [95% Conf. Interval]

------------- +----------------------------------------------------------------

_Iv130_1 | .016556 .0021707 -31.28 0.000 . 0128034 .0214084

_Iv130_2 | .0087124 .0062621 -6.60 0.000 . 002129 .0356531

--------------------------------------------------------------------- ---------

On Sun, Aug 24, 2008 at 4:00 PM, Steven Samuels <sjhsamuels@earthlink.net> wrote:


Sahid, -taboods- gives crude odds, not odds ratios.
Use -svy: logit- with -xi, noomit-; drop the constant, and add option "or".

Note: when referring to commands on Statalist, use hyphens around their names: -tabodds-

-Steve

/**************************************************/
sysuse auto, clear
gen rep= rep78<=3
tab rep
svyset _n

tabodds rep foreign
/* Now svy: logit */
xi, noomit : svy: logit rep i.foreign, nocons or
/*************************************************/

On Aug 24, 2008, at 10:29 AM, Sahid Hocine wrote:


Dear Stalister,

I have a question regarding Stata 10 being a newbee on the field.

I am analyzing a DHS data set *(survey) and for the bivariate crude
analysis I am used to tabodds however it is not supported by the
svy , so I guess I would have to use the logistic command for binary
analysis but the output is not what I want i.e a crude odd ratio by
category. Can I proceed with the svy or the stratification is the only
solution?

Waiting for your help

Sahid




. svy:logistic sd107 v130
(running logistic on estimation sample)

Survey: Logistic regression

Number of strata = 35 Number of obs = 5600
Number of PSUs = 4823 Population size = 5638.5227
Design df = 4788
F( 1, 4788) = 0.77
Prob > F = 0.3795

------------------------------------------------------------------- -----------
| Linearized
sd107 | Odds Ratio Std. Err. t P>|t| [95% Conf. Interval]
------------- +----------------------------------------------------------------
v130 | .5262408 .3844291 -0.88 0.380 . 1256632 2.203743
------------------------------------------------------------------- -----------

. svy:tabodds sd107 v130
tabodds is not supported by svy with vce(linearized); see help svy
estimation for a list of Stata estimation commands
that are supported by svy
r(322);

. :tabodds sd107 v130
unrecognized command: : invalid command name
r(199);

. tabodds sd107 v130

------------------------------------------------------------------- -------
v130 | cases controls odds [95% Conf. Interval]
------------ +-------------------------------------------------------------
muslim | 81 5218 0.01552 0.01246 0.01933
christian | 3 298 0.01007 0.00323 0.03139
------------------------------------------------------------------- -------
Test of homogeneity (equal odds): chi2(1) = 0.55
Pr>chi2 = 0.4602

Score test for trend of odds: chi2(1) = 0.55
Pr>chi2 = 0.4602
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