stremr
stremr copied to clipboard
romainkp
Time dependent propensity models
Different from stratified ps models: how do I specify different variable sets in g_form_TRT?
Not sure, can you provide an example?
Perhaps the easiest is to use time-dependent interactions, but it's not trivial.
On Wed, Jun 26, 2019, 10:31 AM marycombs [email protected] wrote:
Different from stratified ps models: how do I specify different variable sets in g_form_TRT?
— You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub https://github.com/osofr/stremr/issues/44?email_source=notifications&email_token=ABTI6TVB4O2NSCX7XVIPD53P4ORWXA5CNFSM4H3UPZP2YY3PNVWWK3TUL52HS4DFUVEXG43VMWVGG33NNVSW45C7NFSM4G33YFLQ, or mute the thread https://github.com/notifications/unsubscribe-auth/ABTI6TQYHEXL35E455EJ3KTP4ORWXANCNFSM4H3UPZPQ .
For example, if I want to model probability of treatment at time t on “entire treatment history” and baseline covariates, I.e. in an SCM, A(t) = f_{A(t)}(W, \overline{A}(t-1)).
In order to include treatment at previous time points I would create lagged variables and specify them in gform_TRT, however, even if I stratify on time, the only rows with no NAs in the lagged treatment variables will be the last row of an individual with the longest observation time.
Thank you!