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Gender, Race, and Competition: Driving Speed with Randomized Passengers
Last registered on February 22, 2018

Pre-Trial

Trial Information
General Information
Title
Gender, Race, and Competition: Driving Speed with Randomized Passengers
RCT ID
AEARCTR-0002747
Initial registration date
February 21, 2018
Last updated
February 22, 2018 12:40 PM EST
Location(s)
Primary Investigator
Affiliation
Summit Consulting
Other Primary Investigator(s)
Additional Trial Information
Status
Completed
Start date
2016-05-02
End date
2017-06-30
Secondary IDs
Abstract
Using a sample of over 200 carpools randomized on gender and race, I find that race, in addition to gender, is a significant factor in competitive behavior. Competition-averse preferences, often attributed to females generally, may actually be concentrated among white females. On the aggregate, female drivers do indeed drive slower than male drivers in carpools. Disaggregating the effect by race, however, reveals that white females are responsible for the result, as there are no differences in driving speeds between male drivers and non-white female drivers. These results suggest that competition and gender research may be incomplete without accounting for race.
External Link(s)
Registration Citation
Citation
Thompson, Shane. 2018. "Gender, Race, and Competition: Driving Speed with Randomized Passengers." AEA RCT Registry. February 22. https://doi.org/10.1257/rct.2747-1.0.
Former Citation
Thompson, Shane. 2018. "Gender, Race, and Competition: Driving Speed with Randomized Passengers." AEA RCT Registry. February 22. https://www.socialscienceregistry.org/trials/2747/history/26008.
Experimental Details
Interventions
Intervention(s)
Intervention Start Date
2016-05-02
Intervention End Date
2017-06-30
Primary Outcomes
Primary Outcomes (end points)
Driving speed, specifically whether the gender and racial composition of carpools affects driving speeds.
Primary Outcomes (explanation)
Secondary Outcomes
Secondary Outcomes (end points)
Secondary Outcomes (explanation)
Experimental Design
Experimental Design
The slugging commuting process in Washington DC naturally randomizes carpools on gender and race. I measure the effects of various carpool groupings on driving speed.
Experimental Design Details
Randomization Method
Natural randomization. Nature chooses the carpool groupings based on who is next in line.
Randomization Unit
Individual
Was the treatment clustered?
Yes
Experiment Characteristics
Sample size: planned number of clusters
Roughly 150-175 individuals
Sample size: planned number of observations
200 carpools
Sample size (or number of clusters) by treatment arms
Roughly 8 gender/race, driver/passenger combinations, or 25 in each grouping.
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)
IRB
INSTITUTIONAL REVIEW BOARDS (IRBs)
IRB Name
IRB Approval Date
IRB Approval Number
Post-Trial
Post Trial Information
Study Withdrawal
Intervention
Is the intervention completed?
No
Is data collection complete?
Yes
Data Collection Completion Date
June 30, 2017, 12:00 AM +00:00
Final Sample Size: Number of Clusters (Unit of Randomization)
Was attrition correlated with treatment status?
Final Sample Size: Total Number of Observations
Final Sample Size (or Number of Clusters) by Treatment Arms
Data Publication
Data Publication
Is public data available?
No
Program Files
Program Files
Reports and Papers
Preliminary Reports
Relevant Papers