The goal of this process is to determine whether random assignment resulted in nonequivalent
groups. In performing randomization checks, researchers compare study groups or conditions on a number of pretest variables.These typically include demographic variables such as age, gender, level of education, and any other variables that are measured or available prior to the intervention. Importantly, randomization checks should look for between-group differences on the baseline measures of the dependent variables because they are likely to have the most impact on outcomes. Generally, randomization checks involve the use of statistical analyses that can examine differences between groups (as will be discussed in Chapter 7). If differences are found on certain variables, the researcher should determine whether they are correlated with the outcomes. Any such variables that are correlated with outcomes should be controlled for in the final analyses.Randomization Checks The randomization check, as its name suggests, is the process of examining the overall effectiveness of random assignment.The goal of this process is
to determine whether random assignment resulted in nonequivalent groups. In performing randomization checks, researchers compare study groups or conditions on a number of pretest variables.These typically include demographic variables such as age, gender, level of education, and any other variables that are measured or available prior to the intervention.
Importantly, randomization checks should look for between-group differences on the baseline measures of the dependent variables because they are likely to have the most impact on outcomes. Generally, randomization checks involve the use of statistical analyses that can examine differences between groups (as will be discussed in Chapter 7). If differences are found on certain variables, the researcher should determine whether they are correlated with the outcomes. Any such variables that are correlated with outcomes should be controlled for in the final analyses.
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