[R] propensity score adjustment using R

[ran2]

Frank E Harrell Jr wrote:
> 
>  
> 
> That is a high variance procedure as compared with covariate adjustment 
> using the propensity score, or stratification.
> 
> Frank Harrell
> 
Ah, wait what if I got very high dimensional X ?  Even with 20 binary
covariates i would end up with more than 1 million possibilities... 
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