how to calculate adjusted odds ratio using stata9?

[vertica agnihotri]

hii everyone, i am working on case- control studies.i have got positive results on calculating crude OR but now want to calculate adjusted odds ratio. although i have calculated it for age and gender but facing some error whenever i put smoking variable in the command. I am attaching a output file. kindly help me.

[Carlo Lazzaro]

Vertica:
did you take a look at -help logistic-?

[vertica agnihotri]

yes sir. but its giving information regarding commands.

[vertica agnihotri]

How can one arrange data in stata9 if comparing cases and controls with genotypes? Smoking variable will be coded 1 or 0 acc to exposure (for present and absent) or 2,1,0 according to genotypic distribution?

[Marcos Almeida]

Hello Erica,

Welcome to the Forum.

Hidden collinearity and perfect prediction are important problems when performing regression models.

When it comes to logistic regression, here (http://www.stata.com/support/faqs/st...ic-regression/) you may read about the issue as well as how to cope with it.


Hopefully that helps.


Best,

Marcos

[vertica agnihotri]

ok thank you.

[Carlo Lazzaro]

Vertica:
Example 1 in Stata 9 manual under -logistic- entry (page 63) may be helpful.

[vertica agnihotri]

yeah, that was helpful. i was putting data in wrong format. i got results after adjusting different variables
. thnx