Comments (2)
Hi @sergeyf
Yes, the literature has some variations on how exactly the AIPW estimator is written. The main difference you will see is between the IPW plus an augmentation term, or the g-computation plus an augmentation form. These two forms are equivalent (using some algebra you can go back and forth).
The formula I use is provided in Funk et al. 2011 in Table 1 (they call it doubly robust, but it is AIPW). Specifically, y1
is the 'Among X=1' row of the table and y0
is the 'Among X=0'. This works out to be the same in the articles you linked (see the general form in Table 1).
Essentially, my y1
and y0
are doing the two pieces of the AIPW estimator in the linked sources as two pieces. Then they get put together (like the equations do). Doing each piece separately makes it easier to check, allows estimation of other quantities (i.e., risk under X=1, risk ratio, odds ratio), and makes the later variance calculation easier to write
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Ah thank you. I appreciate you taking the time to reply.
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