This sample will then be randomly divided into treatment and control groups.
Perhaps 40% of the sample will be on a campaign’s Get-Out-the-Vote (GOTV) mailing list and the other 60% of the sample will not receive the GOTV mailings.
The use of randomized experimental design should allow a degree of certainty that the research findings cited in studies that employ this methodology reflect the effects of the interventions being measured and not some other underlying variable or variables.
Random assignment is the process of randomly assigning participants into treatment and control groups for the purposes of an experiment.
This could be implemented by applying random assignment separately for male and female participants.
Random numbers make no guarantee that your control and treatment groups will be balanced in any way.Information about the randomization procedure is included in each experiment summary on the site.What are the advantages of randomized experimental designs?The outcome measured –voter turnout– can then be compared in the two groups.The difference in turnout will reflect the effectiveness of the intervention. The key to randomized experimental research design is in the random assignment of study subjects – for example, individual voters, precincts, media markets or some other group – into treatment or control groups.This is because there are, no doubt, qualities about those volunteers that make them different from students who do not volunteer.And, most important for our work, those differences may very well correlate with propensity to vote.Randomization is generally achieved by employing a computer program containing a random number generator.Randomization procedures differ based upon the research design of the experiment.Randomized experimental design yields the most accurate analysis of the effect of an intervention (e.g., a voter mobilization phone drive or a visit from a GOTV canvasser, on voter behavior).By randomly assigning subjects to be in the group that receives the treatment or to be in the control group, researchers can measure the effect of the mobilization method regardless of other factors that may make some people or groups more likely to participate in the political process.
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