what is the effect of playing country music if the gamma variable is not removed from an experiment, what is the null hypothesis for attrition how to overbrace gamma why is country music correlated with patient retention which effect is caused by gamma gamma negative effect in the sample why is gamma low in the experiment what is the hypothesis of the gamma effect when calculating attrition, the null hypothesis is the following why does being a regular negatively affect patients can you adjust for experimentally caused panel attrition in an experiment why is there no long-term effect when playing country music? why is it important to adjust for experimentally-caused panel attrition when evaluating treatment effects? when to adjust for experimentally-caused panel attrition when evaluating treatment effects? which factor determines whether an experiment produces a long-term impact on the panel? why is gamma low in this experiment why is the effect of country music negative why is the gamma of country music indexed? which factor to exclude when evaluating experimentally caused treatment effects