Unformatted text preview: Random Eﬀects Exercise Respond to the following questions individually then discuss your answers in your group. You should hand in your individual response. We will discuss your group responses and then I will lecture on advanced topics.
2 1. Estimate variance components στ and σ 2 from the following oneway random eﬀects ANOVA table: Source Treatment Error Total df 3 24 27 SS 80 120 200 MS 26.67 5 7.41 2. Run the SAS code for a twoway random eﬀects model provided on the web page. Copy the data provided into a Minitab worksheet and analyze the data using General Linear Model under the ANOVA menu. Be sure to list both eﬀects in the Random Factors box and include the interaction in the model box (e.g., C1 C2 C1*C2). (a) For which eﬀects are SAS’s Type III tests correct? Which ones are incorrect? (b) Do you know the SAS commands needed to compute the correct test statistics? Add these command(s) to the SAS source code and compare SAS’s output to Minitab’s GLM Model output. 1 ...
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 Spring '08
 JohnM.Grego
 Statistics, random effects

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