SS1234 - Four Types of Sums of Squares for ANOVA Effects By...

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SS1234.doc Four Types of Sums of Squares for ANOVA Effects © By default, SAS’ PROC GLM gives one Type I and Type III SS . One may obtain nondefault types by specifying the type(s) desired in the MODEL statement. For example, “model rating=D|G|P / SS1 SS2 SS3 SS4;” would give all four types of SS . Download the data file, SS1234.dat and the program SS1234.sas . Run the program and print the program and the listing so you will have examples of the types of SS presented here. The data for this exercise are from the research which was presented in the article: Castellow, W. A., Wuensch, K. L., & Moore, C. H. (1990). Effects of physical attractiveness of the plaintiff and defendant in sexual harassment judgments, Journal of Social Behavior and Personality , 5 , 547-562. The independent variables are DEATTR (experimentally manipulated physical attractiveness of the male defendant accused of sexual harassment), GENDER (gender of the mock juror), and PLATTR (experimentally manipulated physical attractiveness of the female plaintiff). I shall refer to the independent variables with the letters D, G, and P in the text below. The primary dependent variable in this research was the verdict recommended by the mock juror, but we also asked the jurors to rate the litigants on a number of characteristics. For this exercise, our dependent variable is one of those ratings, the jurors’ ratings of the defendant’s physical attractiveness. Type I SS Type I SS are order-dependent (hierarchical, sequential ). Each effect is adjusted for all other effects that appear earlier (to the left) in the model, but not for any effects that appear later in the model. For example, in the first PROC GLM in “SS1234 SAS”
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This note was uploaded on 06/06/2011 for the course STAT 4360 taught by Professor Park during the Spring '11 term at University of Georgia Athens.

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SS1234 - Four Types of Sums of Squares for ANOVA Effects By...

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