[SOLVED] Producing a "Table 1" with Before and After baseline characteristics in IPTW analysis using WeightIt package

Producing a "Table 1" with Before and After baseline characteristics in IPTW analysis using WeightIt package

I am trying to produce a classical "before" and "after" table reporting original cohort and pseudopopulation before and after an IPTW analysis using the WeightIt package.

Essentially, what I want is something like what is reported in the the example provided here: https://stats.stackexchange.com/questions/496599/calculate-single-absolute-standardized-difference-across-levels-of-a-categorical

I've tried to use bal.tab for that, but it seems that only balance summary can be accessed, and not the mean and SD or count and percentages for continuous and binary variables, respectively.

I can I do that?

I provide a workable example of an IPTW analysis.

library(WeightIt)
library(cobalt)
library(survey)

W.out <- weightit(treat ~ age + educ + race + married + nodegree + re74 + re75,
                  data = lalonde, estimand = "ATT", method = "ps")

bal.tab(W.out)

Solution

You can use bal.tab() for this. Just set disp = c("means", "sds"). It's not as pretty as a tableone table but it does contain the same information and is immediately compatible with WeightIt. Note that the idea of a "weighted count" doesn't really apply because the weights are unscaled. Weighted means/proportions are valid, though, and you should report them and can do so with bal.tab().