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2013 Mar 13
1
multi-comparison of means
...means of the 3 methods(a,b,c) pairwisely.
I have 3 ideas:
#idea1
result_aov<-aov(y~ method + x1 + x2)
TukeyHSD(result_aov)
diff lwr upr p adj
b-a 0.845 0.5861098 1.1038902 0.0000001
c-a 0.790 0.5311098 1.0488902 0.0000002
c-b -0.055 -0.3138902 0.2038902 0.8578386
#idea2
library(multcomp)
summary(glht(result_aov,linfct=mcp(method="Tukey")))
Estimate Std. Error t value Pr(>|t|)
b - a == 0 0.3239 0.1402 2.309 0.0683 .
c - a == 0 -0.3332 0.1937 -1.720 0.2069
c - b == 0 -0.6570 0.1325 -4.960 <0.001 ***
#idea3
#ref=a...