NEW UPDATE: Completed trials may now upload and register supplementary documents (e.g. null results reports, populated pre-analysis plans, or post-trial results reports) in the Post Trial section under Reports, Papers, & Other Materials.
Strategy vs. Direct Response Method
Initial registration date
September 20, 2019
September 20, 2019 9:44 AM EDT
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Beijing Normal University
Other Primary Investigator(s)
Harbin Institute of Technology, Shenzhen
Additional Trial Information
Shenzhen Peacock Plan
This document outlines a plan for an experiment that investigates when behavior in experiments that employ the strategy method coincides with or differs from experiments that use the direct response method.
Intervention Start Date
Intervention End Date
Primary Outcomes (end points)
Player 1 and Player 2 choices.
Primary Outcomes (explanation)
Secondary Outcomes (end points)
Player beliefs; Control questions with regards to experimental instructions; survey questions such as gender, age, location, field of study, type of degree, employment status, household income, and previous experience with experiments
Secondary Outcomes (explanation)
Experimental Design Details
randomization is automatically done by a computer at the time the individual starts the experiment
the unit (clusters) of randomization in our experiment is at the individual level
Was the treatment clustered?
Sample size: planned number of clusters
equals the total number of participants
Sample size: planned number of observations
Sample size (or number of clusters) by treatment arms
500 for each of the two strategy method treatments, 1500 for each of the two direct response method treatments
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)
At a power of 80% and a significance level of 10%, the minimum detectable effect size is a difference of 10 percentage points.
INSTITUTIONAL REVIEW BOARDS (IRBs)