A Worthwhile, Conservative Strategy for Minimizing the Possibility of Invalid

Multiple Choice

A worthwhile, conservative strategy for minimizing the possibility of invalid causal conclusions due to differential attrition is ______.

A) ensuring at the outset of the experiment that subject assignment is truly random
B) recruiting only subjects with stable residential histories and ongoing institutional ties
C) combining matching with randomization
D) basing the outcome analysis on comparing all subjects initially assigned to each condition