Gender Identity and Group Contest

Last registered on June 23, 2022


Trial Information

General Information

Gender Identity and Group Contest
Initial registration date
October 09, 2021

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 10, 2021, 9:29 PM EDT

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

Last updated
June 23, 2022, 6:49 AM EDT

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



Primary Investigator

Tilburg University

Other Primary Investigator(s)

PI Affiliation
Tilburg University

Additional Trial Information

In development
Start date
End date
Secondary IDs
Prior work
This trial does not extend or rely on any prior RCTs.
We present an experimental design to investigate the effects of gender identity and group size on group contests. Both in the control and the experimental treatment, groups consisting of only females and males will engage in symmetric group contests (3vs3). In the experimental treatment, the gender compositions will be revealed and players will be primed by filling a gender identity survey and male-female emojis representing players. Furthermore, we will also run the same experiment in an asymmetric group contest (3vs5) setting to examine the relationship between group size and identity. Before and after the group contest, we take individual incentivized social value orientation measures to examine the degree of in-group bias created by the group contest.

External Link(s)

Registration Citation

Aktas, Usame Berk and Florian Heine. 2022. "Gender Identity and Group Contest." AEA RCT Registry. June 23.
Sponsors & Partners

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Experimental Details


Intervention Start Date
Intervention End Date

Primary Outcomes

Primary Outcomes (end points)
Individual investments, Group level investments, Social value orientation angle, Gender Identity measure
Primary Outcomes (explanation)
The social value orientation angle will be constructed with the method used Murphy et al., 2011. Gender Identity measures will be constructed from Cameron(2004).

Secondary Outcomes

Secondary Outcomes (end points)
Risk preferences
Secondary Outcomes (explanation)
Will be asked in the survey

Experimental Design

Experimental Design
Tilburg University’s participant database Sona allows us to see names and the genders of the registered participants prior to the experimental sessions. We will use this information to invite an equal amount of female and male participants. The participants will be allocated to their computers according to their treatment groups. The experiment will be programmed using z-tree by Fischbacher (2007) and conducted at the CentERlab at Tilburg University. Each participant will be sitting in a cubicle, visually separated from each other.

After general instructions, participants in the control group will be asked to fill a social value orientation survey. Afterward, they will play a trial round of a group contest and will be asked to answer few simple questions about the game. Subsequently, they will play 15 rounds of group contest games with gender-neutral emojis representing players. Afterward, they will fill a second social value orientation survey and a gender identity survey. Their payments will be determined after they filled out the demographics questionnaire.

Participants in the experimental group will be informed about the gender composition of the groups and fill a gender identity survey before the first social value orientation survey. After that, they will also play a trial round and 15 rounds of group contests. Afterward second social value orientation survey and a demographic survey will be filled.
Experimental Design Details
Randomization Method
By computer in an office
Randomization Unit
Was the treatment clustered?

Experiment Characteristics

Sample size: planned number of clusters
Around 300 individuals
Sample size: planned number of observations
Around 300 individuals
Sample size (or number of clusters) by treatment arms
Around 300 individuals
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)
We set the alpha value as 0.05.

Institutional Review Boards (IRBs)

IRB Name
TiSEM Institution Review Board (IRB)
IRB Approval Date
IRB Approval Number
IRB EXE 2020-033
Analysis Plan

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Post Trial Information

Study Withdrawal

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Is the intervention completed?
Data Collection Complete
Data Publication

Data Publication

Is public data available?

Program Files

Program Files
Reports, Papers & Other Materials

Relevant Paper(s)

Reports & Other Materials