Nothing
A finitepopulation significance test of the 'sharp' causal null hypothesis that treatment exposure X has no effect on final outcome Y, within the principal stratum of Compliers. A generalized likelihood ratio test statistic is used, and the resulting pvalue is exact. Currently, it is assumed that there are only Compliers and Never Takers in the population.
Package details 


Author  Wen Wei Loh [aut, cre], Thomas S. Richardson [aut] 
Date of publication  20160215 13:47:11 
Maintainer  Wen Wei Loh <wloh@uw.edu> 
License  GPL (>= 3) 
Version  0.2.2 
URL  https://www.stat.washington.edu/~wloh/ 
Package repository  View on CRAN 
Installation 
Install the latest version of this package by entering the following in R:

Any scripts or data that you put into this service are public.
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.