Matching is effective even if there is little or no correlation between a variable used to match subjects and your dependent variable.
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Q78: The different values an independent variable takes
Q79: Within-subjects designs can include only two levels
Q80: The performance of subjects in a control
Q81: Presence or absence is the simplest way
Q82: It is legitimate to infer the shape
Q84: When a strong correlation exists between a
Q85: Multiple control groups are only necessary when
Q86: Matching is just as easy with multigroup
Q87: In within-subjects designs, subjects are exposed to
Q88: All other things being equal, the between-subjects
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