Sample size (or number of clusters) by treatment arms
In Experiment A, randomization was done at the individual level:
* 1/3 members (666 members) receive T0
* 1/3 members (666 members) receive T1
* 1/3 members (666 members) receive T2
In Experiment B, randomization was done at the shop level and then the individual level:
* 1/6 shops (345 shops) in which all members (6,281 members) receive T0
* 1/2 shops (1,035 shops) in which 1/3 members receive T0 (6,240 members), 1/3 T1 (6,239 members), and 1/3 T2 (6,240 members)
* 1/3 shops (691 shops) in which 1/2 members receive T1 (6,332 members) and 1/2 T2 (6,331 members)
In Experiment C, randomization was done at the shop level and then the individual level:
* 1/6 shops (714 shops) in which all members (4,951 members) receive T0
* 1/2 shops (2,145 shops) in which 1/3 members receive T0 (4,822 members), 1/3 T1 (4,821 members), and 1/3 T2 (4,822 members)
* 1/3 shops (1,429 shops) in which 1/2 members receive T1 (4,897 members) and 1/2 T2 (4,896 members)