l on subgroups:
## Est of E[Y|T=0,Recom=0]-E[Y|T=/=0,Recom=0] 
##                          11.8704 (n = 223) 
## Est of E[Y|T=1,Recom=1]-E[Y|T=/=1,Recom=1] 
##                           7.8903 (n = 277) 
## 
## NOTE: The above average outcomes are biased estimates of
##       the expected outcomes conditional on subgroups. 
##       Use &#39;validate.subgroup()&#39; to obtain unbiased estimates.
## 
## ---------------------------------------------------
## 
## Benefit score quantiles (f(X) for 1 vs 0): 
## 