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Can simple advice eliminate the gender gap in willingness to compete?
Last registered on November 19, 2018

Pre-Trial

Trial Information
General Information
Title
Can simple advice eliminate the gender gap in willingness to compete?
RCT ID
AEARCTR-0003487
Initial registration date
November 13, 2018
Last updated
November 19, 2018 11:17 PM EST
Location(s)

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Primary Investigator
Affiliation
WZB Berlin
Other Primary Investigator(s)
PI Affiliation
DIW Berlin and Humboldt University
Additional Trial Information
Status
In development
Start date
2018-11-15
End date
2019-12-01
Secondary IDs
Abstract
Starting from Niederle and Vesterlund (2007), a large number of lab experiments report that men are more likely to enter tournaments. We aim to test whether advising women to compete more and advising men to compete less decreases the gender gap in willingness to compete. We use three different forms of advice that emphasize the role of competitiveness, risk preferences and overconfidence respectively. We will investigate both the average effect across the three forms, and the effect of each form on its own.
External Link(s)
Registration Citation
Citation
Mollerstrom, Johanna and Roel van Veldhuizen. 2018. "Can simple advice eliminate the gender gap in willingness to compete?." AEA RCT Registry. November 19. https://doi.org/10.1257/rct.3487-1.0.
Former Citation
Mollerstrom, Johanna and Roel van Veldhuizen. 2018. "Can simple advice eliminate the gender gap in willingness to compete?." AEA RCT Registry. November 19. https://www.socialscienceregistry.org/trials/3487/history/37572.
Experimental Details
Interventions
Intervention(s)
Intervention Start Date
2018-11-15
Intervention End Date
2018-11-22
Primary Outcomes
Primary Outcomes (end points)
The effect of advice on tournament entry
Primary Outcomes (explanation)
The effect of advice on tournament entry is computed by subtracting the choice made prior to receiving advice (1-tournament, 0-piece rate) from the choice made after receiving advice.
Secondary Outcomes
Secondary Outcomes (end points)
Elicited beliefs, risk preferences, non-competitive price list, efficiency
Secondary Outcomes (explanation)
See the pre-analysis plan
Experimental Design
Experimental Design
We aim to test whether advising women to compete more and advising men to compete less decreases the gender gap in willingness to compete. We use three different forms of advice and will investigate both the average effect across the three forms, and the effect of each form on its own.
Experimental Design Details
Not available
Randomization Method
Randomization done by the computer
Randomization Unit
Treatments are randomized within-session at the individual level.
Was the treatment clustered?
No
Experiment Characteristics
Sample size: planned number of clusters
360 (estimated)
Sample size: planned number of observations
360 (estimated). We will stop running sessions once we reach the desired sample size, provide we obtain data for at least 160 men and 160 women.
Sample size (or number of clusters) by treatment arms
120 (estimated)
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)
The minimum detectable effect size is a 15 percentage point difference between men and women in the effect of advice. This gives us a power of at least .838; more details are presented in the attached power calculations file.
Supporting Documents and Materials

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IRB
INSTITUTIONAL REVIEW BOARDS (IRBs)
IRB Name
WZB Research Ethics Committee
IRB Approval Date
2018-10-26
IRB Approval Number
2018/4/49
Analysis Plan

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