Examlex
Evaluate the degree to which party identification changed among white southerners from 1952 to the present.
External Validity
The extent to which the results of a study can be generalized to other situations, populations, or time periods beyond the study itself.
Diffusion
In experimental design, the problem of a treatment effect spreading from group to group as people communicate.
Treatment Effect
The difference in outcomes between a group receiving an intervention and a control group in an experimental study.
Factorial Designs
Experimental designs that manipulate two or more variables at a time.
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