Psychology 2800E Lecture Notes - Lecture 17: Factorial Experiment

• School: Western University
• Department: Psychology
• Course: Psychology 2800E
• Professor: Patrick Brown

Document Summary

Complex design = more than one variable is manipulated at the same time. Factorial design: each variable is manipulated at all levels of each other variable. Main effect: the effect of one variable in a multi-variable design, ignoring all other variables. Compare average of a1b1 & a1b2 (a1) and average of a2b1 & a2b2 (a2) to give the main effect of a. Contains no info about the effect of variable b. Compare averages of a1b1 & a2b1 (b1) and averages of a1b2 & a2b2 (b2) to give main effect of b. Contains no info about the effect of a. Simple main effect: the effect of one variable in a multi-variable design, observed at one level of a second variable. [a1b1 - a2b1] gives sme of a at level b1 of variable b. [a1b2 - a2b2] gives sme of a at level b2 of variable b. [a1b1 - a1b2] gives sme of b at level a1 of variable a.