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Field
Sample size (or number of clusters) by treatment arms
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Before
Randomization A: 4,000 invites to arm A; our goal is to have a total of around 360 acceptances. Similar studies have had acceptance rates between 12-20%. If the acceptance rate is 12% then we expect that approximately 480 will accept. If the acceptance rate is 20% we expect that around 800 will accept. We have set a goal of around 360 acceptances and will not hire workers after we hit that goal due to budgetary constraints.
Randomization B: 4,000 invites to “Framed Field Experiment” arm; our goal is to have a total of around 360 acceptances. We will follow a procedure similar to that for Randomization A to do our best to obtain this goal.
Randomization C, D, E and F: 2000 invites each; our goal is to have a total of around 180 acceptances in each of these four arms. Similar studies have had acceptance rates between 12-20%. If the acceptance rate is 12% then we expect approximately 240 will accept. If instead the acceptance rate is 20% we expect that around 400 will accept. We have set a goal of around 180 acceptances and will not hire workers after we hit that goal due to budgetary constraints.
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After
Randomization A: 4,000 invites to arm A; our goal is to have a total of around 360 acceptances. Similar studies have had acceptance rates between 12-20%. If the acceptance rate is 12% then we expect that approximately 480 will accept. If the acceptance rate is 20% we expect that around 800 will accept. We have set a goal of around 360 acceptances and will not hire workers after we hit that goal due to budgetary constraints.
Randomization B: 4,000 invites to arm B; our goal is to have a total of around 360 acceptances. We will follow a procedure similar to that for Randomization A to do our best to obtain this goal.
Randomization C, D, E and F: 2000 invites each; our goal is to have a total of around 180 acceptances in each of these four arms. Similar studies have had acceptance rates between 12-20%. If the acceptance rate is 12% then we expect approximately 240 will accept. If instead the acceptance rate is 20% we expect that around 400 will accept. We have set a goal of around 180 acceptances and will not hire workers after we hit that goal due to budgetary constraints.
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