SAN JOSÉ STATE UNIVERSITY College of Social WorkS. W. 242Spring 2008Edward CohenWeek 9 March 21, 2008 •Note on your calendar: I’ll be out of town Thursday April 3 (no office hours) •Let’s slow down—nagging questions, unfinished business, general confusion? •Discuss Final Paper (don’t slow down too much!) •Prep for ANOVA •Happy Spring Break! Concepts you should know:•When to use ANOVA •One-way ANOVA •Two-way ANOVA (or Two-factor ANOVA) •Fstatistic •Within-groups variation •Between-groups variation •Post-hoctests •Multiple comparisons I.When to use ANOVA? A.Remember that the t-test compared means (of ratio or interval level variables) along the attributes of a dichotomous nominal variable (e.g. a variable with only two attributes such as male and female), i.e. comparing only two means at a time B.ANOVA is a distant cousin to the t-test. It compares means for categorical (nominal or ordinal) variables with three or more attributes, i.e. it compares three or more means, for example 1.Are there differences between the mean LCSW licensing scores for MSW graduates of various ethnicities? 2.For children residing in residential treatment does the number of behavioral outbursts vary by level of self esteem (High, Medium, Low)? 3.In an experimental study of treatment for depression, clients are randomized to the following groups: 1) medication only, 2) medication plus individual psychotherapy, and 3) psychotherapy only. Do the clients in the “medication plus psychotherapy” group show more improved outcomes (lower depression scores) than the other two groups? II.How it works 1
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