PSYCH 3090 Lecture Notes - Lecture 33: Ronald Fisher, Analysis Of Variance, Statistical Hypothesis Testing
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Problem with multiple t tests: many statistical tests o o. 0. 95 21=0. 66 p=1 : familywise error rate > . In anova, the iv is often referred to as a factor. In this chapter, there is one factor (one- way anova). In the next chapter, there is more than one factor (e. g. , two-way anova): possible exam question, if there are a bunch of groups, how would you analyze groups and what method would you use. B: procedure, take the total variation among the scores. Within-groups variation: variation due to chance, variance will happen no matter what. Between-groups variation: variation due to chance and treatment effect (if any exists, consists of two pieces (chance and treatment effect) S stotal=ssw+s sbet: total sum of squares (sstotal) = numerator of the variance, within groups sum of squares (ssw, between groups sum of squares (ssbet) X x 2: sigma = all scores, x = scores o.
