lab 9 - EXST 7005 Fall 2010 Lab #9: Post ANOVA Tests...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
1 EXST 7005 Fall 2010 Lab #9: Post ANOVA Tests Post-hoc Tests A simple ANOVA program containing only class and model statements will return the ANOVA table with source, degrees of freedom, Type I and III sums of squares, mean square errors, F- values for individual tests, and their associated p-values. However, it only tells us whether or not the means are equal across all the classes. If the means are not all equal, we need to know how to detect which means are different and how to find meaningful conclusions. Using a means statement in the PROC GLM procedure will provide the mean value of the dependent variable at each treatment level. Additionally, we can use post hoc tests as options in this statement to perform a variety of multiple comparisons that provide information about the differences between treatment levels. The post hoc tests include LSD, Bonferroni, Duncan, Tukey, and Scheffe (ordered from the least conservative to the most conservative). You need to indicate which post hoc test you want to use in the means statement. Lsmeans The lsmeans statement provides adjusted least-square means for the main effects. In balanced designs these are the same as the raw means, but in unbalanced designs you need to use lsmeans instead. Options available after the slash (/) in the lsmeans statement include the standard error of
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 12/29/2011 for the course EXST 7005 taught by Professor Geaghan,j during the Fall '08 term at LSU.

Page1 / 3

lab 9 - EXST 7005 Fall 2010 Lab #9: Post ANOVA Tests...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online