PSYC 301 Lecture Notes - Lecture 7: Latin Square, Repeated Measures Design, Internal Validity
20 Aug 2016
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Chapter 7 - repeated measures sometimes it is more effective to have subjects participate in all conditions in an experiment; also called within-subjects design reasons for use. Need fewer participants than independent groups design. Some experiments require this design advantage: individual differences can"t confound iv being measured in experiment threats to internal validity. Practice effects-changes participants undergo due to repeated testing. Performance can go up or down complete repeated measures design. Balance practice effects by having subject experience each condition several times. Use when each condition is brief block randomization. Generate a random order of the block (ex: abc, acb, bac, bca) Practice effects are averaged across the many presentations of the conditions. Requires many presentations to balance practice effects. A random sequence of all conditions presented, followed by the opposite of the sequence. Repeat with new random sequence and opposite. Each condition has the same amount of practice effects.
