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An experiment in message design
Last registered on October 13, 2020

Pre-Trial

Trial Information
General Information
Title
An experiment in message design
RCT ID
AEARCTR-0006414
Initial registration date
October 03, 2020
Last updated
October 13, 2020 3:16 PM EDT
Location(s)

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Primary Investigator
Affiliation
University of California, Berkeley
Other Primary Investigator(s)
Additional Trial Information
Status
In development
Start date
2020-10-05
End date
2021-08-31
Secondary IDs
Abstract
This study examines the effect of financial and nonfinancial incentives on motivating people to come up with effective text messages. Further study information will be released after data collection has been completed to avoid the possibility of demand effects.
External Link(s)
Registration Citation
Citation
Otis, Nicholas. 2020. "An experiment in message design." AEA RCT Registry. October 13. https://doi.org/10.1257/rct.6414-2.1.
Experimental Details
Interventions
Intervention(s)
Further study information will be released after data collection has been completed to avoid the possibility of demand effects.
Intervention Start Date
2020-10-31
Intervention End Date
2020-11-30
Primary Outcomes
Primary Outcomes (end points)
Percent of participants who respond to each message, and who answer quiz questions correctly.
Primary Outcomes (explanation)
Secondary Outcomes
Secondary Outcomes (end points)
Secondary Outcomes (explanation)
Experimental Design
Experimental Design
Further study information will be released after data collection has been completed to avoid the possibility of demand effects.
Experimental Design Details
Not available
Randomization Method
Randomization is done by computer.
Randomization Unit
Randomization takes place at the individual level.
Was the treatment clustered?
Yes
Experiment Characteristics
Sample size: planned number of clusters
1,000 participants.
Note the number of participants will be a function of two screening criteria: Whether the messages that participants come up with violate five rules described in the survey body, and whether the participants pass all four (pre-randomization) survey screening questions.
Sample size: planned number of observations
Approximately 2,000 messages (before screening criteria are applied).
Sample size (or number of clusters) by treatment arms
Approximately 330 messages per condition (for main randomizations, before screening criteria are applied).
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)
IRB
INSTITUTIONAL REVIEW BOARDS (IRBs)
IRB Name
University of California, Berkeley. Office for Protection of Human Subjects
IRB Approval Date
2020-04-10
IRB Approval Number
2020-03-13099