Changes between Version 5 and Version 6 of SOPs/anova

Timestamp:

03/11/14 16:49:12 (11 years ago)

Author:

gbell

Comment:

--

SOPs/anova

@@ -52 +52 @@
 ==== Dunnett ====
   * Useful if you want to compare a reference group to all other groups (instead of doing an all vs. all comparison) 
-  * The first group ("a" in this example) is used as the reference group, so name your groups so this is the case.
+  * The first group ("a" in this example) is used as the reference group.  If this is not the case, use the relevel() command to set the reference, like ''strains$group = relevel(strains$group, "reference")''
 
 {{{
 library(multcomp)
-summary(glht(lm(weight ~ group, data=strains), linfct=mcp(group="Dunnett")))
+summary(glht(aov(weight ~ group, data=strains), linfct=mcp(group="Dunnett")))
 }}}