4c_ difference of means

4c_ difference of means - Advanced Topics in Forest...

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Unformatted text preview: Advanced Topics in Forest Biometrics – FOR6934 Mean separation procedures Fal 2007, C. Staudhammer Slide 2 What do we do next, when we find significant differences among treatments? ¡ Back to the plantation example… Type 3 Tests of Fixed Effects Num Den Effect DF DF F Value Pr > F DeploymentID 1 6 1.36 0.2873 FamilyID 1 6 11.87 0.0137 DeploymentI*FamilyID 1 6 8.53 0.0266 year 4 48 5378.72 <.0001 DeploymentID*year 4 48 3.31 0.0178 FamilyID*year 4 48 7.63 <.0001 Deploym*FamilyI*year 4 48 3.91 0.0079 ¡ What factors are significant? ¡ Which do we investigate first? Fal 2007, C. Staudhammer Slide 3 Testing the difference between means ¢ Since we have a higher order interaction, we know there are significant differences between deployments, but there are differences by year and family Æ We must investigate this interaction ¢ Use PROC MIXED LSMEANS statement, with the ADJUST option Fal 2007, C. Staudhammer Slide 4 Testing the difference between means – SAS statements PROC MIXED DATA =lob COVTEST; CLASS plot deploymentid familyid year tree; MODEL dbh_cm= deploymentid| familyid | year; RANDOM plot*deploymentid plot*deploymentid*familyid...
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This note was uploaded on 07/23/2011 for the course FOR 6934 taught by Professor Staff during the Spring '08 term at University of Florida.

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4c_ difference of means - Advanced Topics in Forest...

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