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Field
Last Published
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Before
October 03, 2018 04:56 PM
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After
December 27, 2018 05:57 AM
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Field
Intervention Start Date
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Before
September 06, 2018
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After
January 02, 2019
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Field
Intervention End Date
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Before
November 30, 2018
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After
February 28, 2019
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Field
Experimental Design (Public)
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Before
Some participants will receive message or incentive programs for only one behavior, some will receive messaging programs for both behaviors, and some will receive the message program for one behavior plus "distracting" messages that do not correspond to any behavior. The key outcome of interest will be whether or not participants engage in each action at the individual-day level. By looking at spillovers and interactions between interventions, we will be able to distinguish between two types of limited attention -- internal and external -- with important policy implications.
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After
Some participants will receive message or incentive programs for only one behavior, and some will receive messaging programs for both behaviors. The key outcome of interest will be whether or not participants engage in each action at the individual-day level. By looking at spillovers and interactions between interventions, we will be able to distinguish between two types of limited attention -- internal and external -- with important policy implications.
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Field
Randomization Method
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Before
Randomization is done within the Qualtrics survey, stratified on six variables (see Pre Analysis Plan)
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After
Randomization is done in office by a computer, re-randomized on six variables (see Pre Analysis Plan)
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Field
Power calculation: Minimum Detectable Effect Size for Main Outcomes
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Before
The minimum detectable effect size for both spillovers and crowd-out is 6 percentage points, or about 0.18 standard deviations. This constitutes a 50% reduction in a behavior, relative to the control (in the case of spillovers), or a 30% reduction in the efficacy of the program (in the case of crowd-out).
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After
The minimum detectable effect size for both spillovers and crowd-out is a 35% reduction in a behavior. This will translate into different units and standardized effects depending on the outcome.
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