HRS 610 Lecture Notes - Lecture 11: Dependent And Independent Variables
18 Sep 2016
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Document Summary
Introduce the iv and select two levels. Measure the effect of the iv on the dv. It is similar to the posttest only design, but the dependent variable is measured prior to introducing the iv. It allows researchers to determine if groups are equivalent at the start of an experiment. It is also useful if attrition is a potential problem. Participant assignment: independent groups design/between-subjects design, repeated measures design/within-subjects design. Independent groups design: random assignment is used to put participants into conditions. Repeated measures design: the same individuals participate in both conditions, this design in very sensitive to finding differences between groups. Why: possible problems include the practice effect, fatigue effect, and carryover effect. Repeated measures design: counterbalancing can address potential problems with this design. What does this mean: latin squares also addresses the problem and ensures that each condition appears at each ordinal position, and each condition precedes or follows each condition at least once.
