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Experiments to facilitate charitable giving and understand customer behavior
Last registered on November 20, 2019

Pre-Trial

Trial Information
General Information
Title
Experiments to facilitate charitable giving and understand customer behavior
RCT ID
AEARCTR-0005001
Initial registration date
November 19, 2019
Last updated
November 20, 2019 3:02 PM EST
Location(s)

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Primary Investigator
Affiliation
Stanford University
Other Primary Investigator(s)
PI Affiliation
Northwestern University
PI Affiliation
Stanford University
Additional Trial Information
Status
In development
Start date
2019-11-07
End date
2021-02-28
Secondary IDs
Abstract
This study examines how the display of charities and impact-related information affects consumers’ donation behavior following being offered the opportunity to add a donation to charity when checking out from an online shopping website.
External Link(s)
Registration Citation
Citation
Athey, Susan, Dean Karlan and Henrike Steimer. 2019. "Experiments to facilitate charitable giving and understand customer behavior." AEA RCT Registry. November 20. https://doi.org/10.1257/rct.5001-1.0.
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Experimental Details
Interventions
Intervention(s)
This study examines how the display of charities and impact-related information affects consumers’ donation behavior following being offered the opportunity to add a donation to charity when checking out from an online shopping website.
Intervention Start Date
2019-11-19
Intervention End Date
2021-02-28
Primary Outcomes
Primary Outcomes (end points)
At the user-level:
1. Whether or not a user donates to charity
2. Total and average donation amounts per user over entire time period
3. Number of charities donated to over entire time period
4. Proportion of total donations to charities with impact info

At the user-session level:
5. Whether or not a user donates to charity
Primary Outcomes (explanation)
Secondary Outcomes
Secondary Outcomes (end points)
Secondary Outcomes (explanation)
Experimental Design
Experimental Design
This study examines how the display of charities and impact-related information affects consumers’ donation behavior following being offered the opportunity to add a donation to charity when checking out from an online shopping website.
Experimental Design Details
Not available
Randomization Method
Online A/B test. Customers using the payment services will be randomized into one of several conditions using the collaborator's system.
Randomization Unit
customer
Was the treatment clustered?
No
Experiment Characteristics
Sample size: planned number of clusters
1
Sample size: planned number of observations
We estimate approximately 50,000,000 users.
Sample size (or number of clusters) by treatment arms
We will include all users who use the collaborator’s services between the set dates.
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)
Our intended sample size is approximately 50,000,000 user-sessions total. Based on power analyses, we estimate that this is adequate to detect a 0.1 percentage points difference in engagement between the major treatment groups.
IRB
INSTITUTIONAL REVIEW BOARDS (IRBs)
IRB Name
Stanford University, Penelope D Eckert, Ph.D., Administrative Panel on Human Subjects in Non-Medical Research
IRB Approval Date
2019-10-25
IRB Approval Number
49537