PSC 41 Lecture Notes - Lecture 12: Road Space Rationing, Dependent And Independent Variables, Factorial Experiment
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PSC 41 Full Course Notes
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Comparing differences within each participant: each participant experiences all levels of the independent variable, each participant"s performance in the treatment condition is compared to his or her own performance in the control condition. Therefore you know that your groups are identical: same iq, same history, same expectations . One group interact with own toddler measure oxytocin interact with new toddler measure oxytocin. Addressing threats to internal validity within subjects designs/repeated measures. Or, make sure that both groups are being gathered simultaneously: history effect. Random assignment to counterbalance order: selection effect. If they drop out, they drop out of both conditions: mortality effect. Do the threats to internal validity effect one condition more than another: if there are asymmetric effects then your groups are no longer equal. Practice or transfer effects will increase performance over time. Boredom or fatigue effects will decrease performance over time. Not enough between-groups difference: ineffective manipulation, insensitive measures, ceiling or floor effects (on dv or iv)
