THE IMPACT OF INCENTIVES FOR VACCINATION: SURVEY SELECTION

Last registered on July 19, 2022

Pre-Trial

Trial Information

General Information

Title
THE IMPACT OF INCENTIVES FOR VACCINATION: SURVEY SELECTION
RCT ID
AEARCTR-0009583
Initial registration date
June 14, 2022

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
June 15, 2022, 10:18 AM EDT

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

Last updated
July 19, 2022, 9:15 AM EDT

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

Locations

Region

Primary Investigator

Affiliation
University of Zurich

Other Primary Investigator(s)

PI Affiliation
University of Lausanne
PI Affiliation
University of Copenhagen
PI Affiliation
Columbia University
PI Affiliation
University of Chicago
PI Affiliation
Lund University

Additional Trial Information

Status
Completed
Start date
2022-06-14
End date
2022-07-15
Secondary IDs
Prior work
This trial does not extend or rely on any prior RCTs.
Abstract
We study whether mentioning that a study is about COVID-19 vaccination leads to sample selection. We will randomly allocate participants to a condition where the consent form mentions that the study is about COVID-19 vaccination or to a condition without this information. After the consent form, we ask participants about COVID-19 vaccination behaviors. We will hence be able to understand whether telling participants that the research study is about COVID-19 vaccination impacts vaccination attitudes.
External Link(s)

Registration Citation

Citation
Campos-Mercade, Pol et al. 2022. "THE IMPACT OF INCENTIVES FOR VACCINATION: SURVEY SELECTION." AEA RCT Registry. July 19. https://doi.org/10.1257/rct.9583
Experimental Details

Interventions

Intervention(s)
Intervention Start Date
2022-06-14
Intervention End Date
2022-07-15

Primary Outcomes

Primary Outcomes (end points)
Have you taken a second dose of a COVID-19 vaccine? (Yes/No)
Primary Outcomes (explanation)

Secondary Outcomes

Secondary Outcomes (end points)
Secondary Outcomes (explanation)

Experimental Design

Experimental Design
We study whether mentioning that a study is about COVID-19 vaccination leads to sample selection. We will randomly allocate participants to a condition where the consent form mentions that the study is about COVID-19 vaccination or to a condition without this information. After the consent form, we ask participants about COVID-19 vaccination behaviors. We will hence be able to understand whether telling participants that the research study is about COVID-19 vaccination impacts vaccination attitudes.
Experimental Design Details
Randomization Method
Randomization is done by a computer
Randomization Unit
Randomization is done at the individual level
Was the treatment clustered?
No

Experiment Characteristics

Sample size: planned number of clusters
1000 individuals
Sample size: planned number of observations
1000 individuals
Sample size (or number of clusters) by treatment arms
500 individuals in each of the two treatment arms
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)
Following our power calculations, 1,000 participants would give us 80% power to detect an effect size of 0.2 standard deviations.
IRB

Institutional Review Boards (IRBs)

IRB Name
Human Subjects Committee of the Faculty of Economics, Business Administration, and Information Technology at University of Zurich
IRB Approval Date
2022-06-08
IRB Approval Number
2022-045

Post-Trial

Post Trial Information

Study Withdrawal

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Intervention

Is the intervention completed?
No
Data Collection Complete
Data Publication

Data Publication

Is public data available?
No

Program Files

Program Files
Reports, Papers & Other Materials

Relevant Paper(s)

Reports & Other Materials