An experiment in message design

Last registered on January 04, 2022

Pre-Trial

Trial Information

General Information

Title
An experiment in message design
RCT ID
AEARCTR-0006414
Initial registration date
October 03, 2020

Initial registration date is when the trial was registered.

It corresponds to when the registration was submitted to the Registry to be reviewed for publication.

First published
October 05, 2020, 10:35 AM EDT

First published corresponds to when the trial was first made public on the Registry after being reviewed.

Last updated
January 04, 2022, 1:06 AM EST

Last updated is the most recent time when changes to the trial's registration were published.

Locations

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Primary Investigator

Affiliation
University of California, Berkeley

Other Primary Investigator(s)

Additional Trial Information

Status
In development
Start date
2021-10-01
End date
2022-12-30
Secondary IDs
Prior work
This trial does not extend or rely on any prior RCTs.
Abstract
This study examines the effect of incentives on motivation to develop effective text messages. Further study information will be released after data collection has been completed to avoid demand effects.
External Link(s)

Registration Citation

Citation
Otis, Nicholas. 2022. "An experiment in message design." AEA RCT Registry. January 04. https://doi.org/10.1257/rct.6414
Experimental Details

Interventions

Intervention(s)
Further study information will be released after data collection has been completed to avoid demand effects.
Intervention Start Date
2021-10-31
Intervention End Date
2022-12-30

Primary Outcomes

Primary Outcomes (end points)
Percent of participants who opt in to receive information on coronavirus.
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 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
At least 1,650 participants (messages) after applying screening criteria.
Sample size: planned number of observations
The messages will be distributed to at least 1,650*25=41,250 numbers.
Sample size (or number of clusters) by treatment arms
Approximately 550 messages per condition after applying screening criteria.
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)
Supporting Documents and Materials

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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