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Field
Trial Status
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Before
in_development
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After
on_going
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Field
Trial End Date
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Before
October 26, 2020
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After
November 27, 2020
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Field
Last Published
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Before
July 16, 2020 10:25 PM
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After
August 19, 2020 10:56 AM
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Field
Intervention End Date
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Before
August 24, 2020
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After
September 25, 2020
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Field
Experimental Design (Public)
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Before
I will recruit adults living in the United States from mental-wellness-related communities to participate in a survey-type economic experiment. Participants will be randomly assigned to an experimental condition. All participants in all conditions will be asked to rank their interest in four categories of mental wellness apps. They will then be asked to choose between pairs of apps from their preferred categories. Participants in the treatment conditions will receive access to my privacy-policy ratings in addition to the information provided to the control conditions. One of the app choices will be selected for reimbursement of a one-month subscription. I will follow up over the next few weeks about the use of that app, and I will pay participants for their time. Data analysis will be based on the experimental condition, the app information visible to participants, and controls for the demographic characteristics participants provide.
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After
I will recruit adults living in the United States to participate in a survey-type economic experiment. Participants will be randomly assigned to an experimental condition. All participants in all conditions will be asked to rank their interest in four categories of mental wellness apps. They will then be asked to choose between pairs of apps from their preferred categories. Participants in the treatment conditions will receive access to my privacy-policy ratings in addition to the information provided to the control conditions. One of the app choices will be selected for reimbursement of a one-month subscription. I will follow up over the next few weeks about the use of that app, and I will pay participants for their time. Data analysis will be based on the experimental condition, the app information visible to participants, and controls for the demographic characteristics participants provide.
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Field
Planned Number of Clusters
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Before
400 adults
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After
100 adults initial sample (out of 400 targeted) and 250 adults supplemental sample
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Field
Planned Number of Observations
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Before
400 adults
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After
100 adults initial sample (out of 400 targeted) and 250 adults supplemental sample
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Field
Sample size (or number of clusters) by treatment arms
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Before
100 adults control, 100 adults treatment, 200 adults willingness-to-pay
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After
125 adults control, 125 adults treatment in the supplemental sample
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Field
Power calculation: Minimum Detectable Effect Size for Main Outcomes
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Before
0.2 standard deviations for one-mean tests, 15 to 20 percentage points for two-proportions tests (depending on attrition)
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After
15 percentage points for paired-proportions test, 20 percentage points for two-proportions tests
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