Incorporated comments from Matt and Arun
Incorporated comments from Matt and Arun

Modifications based on Matt Dowle and Arunkumar Srinivasan’s helpful
comments.

LiyangQin/Biostat-578,raphg/Biostat-578,raphg/Biostat-578,c5sire/Biostat-578,c5sire/Biostat-578,Temerson0/Biostat-578,c5sire/Biostat-578,LiyangQin/Biostat-578,Temerson0/Biostat-578,raphg/Biostat-578,Temerson0/Biostat-578,LiyangQin/Biostat-578