Stratifying in logistic regression

[Joceynne McRae]

Hello, I am attempting to conduct a logistic regression and I want to stratify by a group that I have created called tri_site (This represents trimester of pregnancy and hospital attended)

The outcome variable is fluvac_thispreg_y_n

I am not sure if I am approaching the coding correctly.

Any advice would be appreciated.

Many thanks
Jocelynne

[Carlo Lazzaro]

Jocelynne:
try:

bysort tri_site: <your regression code>

[Joseph Coveney]

I suggest stratifying by the two component characteristics separately, just like the stratification that you're doing with all of your other predictors.

logistic fluvac_thispreg_y_n ///
    i.(first_preg2 age_grp2 indigenous4 education_grp non_english irsad_grp trimester clinic)

[Joceynne McRae]

Thank you both, I'll give it a go.
Regards
Jocelynne