Feedback in Homogenous Groups
Last registered on March 09, 2020

Pre-Trial

Trial Information
General Information
Title
Feedback in Homogenous Groups
RCT ID
AEARCTR-0005540
Initial registration date
March 09, 2020
Last updated
March 09, 2020 7:45 PM EDT
Location(s)

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Primary Investigator
Affiliation
Johannes Gutenberg-University Mainz
Other Primary Investigator(s)
Additional Trial Information
Status
In development
Start date
2019-01-22
End date
2020-12-23
Secondary IDs
Abstract
Public rank feedback increases productivity and learning effort. Often the comparison group of peers is the classroom. n digital environments, however, group compilation is up to the experimenter. In a field experiment we vary the probability that learning leads to a rank change by manipulating the group composition. 13,800 college-level learners are allocated to three treatment arms and feedback groups of ten. Every month groups are reset, and participants reassigned, but remain in their treatment arm. Participants in the control arm are assigned to feedback groups at random which leads to a high within-group skill heterogeneity. The treatment arm consists of feedback groups with students with a similar learning history and therefore exhibits low within-group skill heterogeneity. The third arm does not receive feedback. We expect more interaction with the learning platform in the treatment group and higher scores in a final standardized test a subgroup of learners will take.
External Link(s)
Registration Citation
Citation
Klausmann, Tim. 2020. "Feedback in Homogenous Groups." AEA RCT Registry. March 09. https://doi.org/10.1257/rct.5540-1.0.
Sponsors & Partners

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Experimental Details
Interventions
Intervention(s)
Intervention Start Date
2020-03-10
Intervention End Date
2020-12-23
Primary Outcomes
Primary Outcomes (end points)
Platform interaction / Online learning measured in solved tasks
Primary Outcomes (explanation)
Secondary Outcomes
Secondary Outcomes (end points)
Performance in training tests on the platform (subgroup)
Performance in a standardized, final, and high-stake offline test (subgroup)
Secondary Outcomes (explanation)
Experimental Design
Experimental Design
Participants are assigned randomly and in equal share to three groups: Participants in the control group are assigned to groups at random. The treatment group consists of groups with students with a similar learning history. The third group does not receive feedback.
Experimental Design Details
Not available
Randomization Method
Computer-based randomization by script on a server of the cooperation partner.
Randomization Unit
individual
Was the treatment clustered?
No
Experiment Characteristics
Sample size: planned number of clusters
13,800
Sample size: planned number of observations
13,800
Sample size (or number of clusters) by treatment arms
4,600 treatment group,
4,600 control group,
4,600 not treated
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)
IRB
INSTITUTIONAL REVIEW BOARDS (IRBs)
IRB Name
Gemeinsame Ethik-Kommission der Abteilung Wirtschaftswissenschaften des Fachbereichs 03 Rechts- und Wirtschaftswissenschaften der Johannes Gutenberg Universit├Ąt Mainz und des Fachbereichs Wirtschaftswissenschaften der Goethe Universit├Ąt Frankfurt
IRB Approval Date
2020-02-06
IRB Approval Number
N/A