One way ANOVA in R

The one way analysis of variance is used to test if three or more means are equal. One way ANOVA is an extension of two independent samples t-test.

using R

• Open the R console
• Change the working directory to the directory where your file is"

   setwd('C:/Users/yourfolder')

• Read the file: E.g the file used here is smaple.csv. The file has three groups with the following format

Header 1	Header 2	Header 3
a	b	c
d	e	f

• Read the file and name it (e.g metab)

   metab <- read.csv ("sample.csv, header= T)

• confirm the file is imported. When you call for metab and press enter you should see the table
• make box plot

   boxplot(metab)

• Then use the following command to conduct one way anova and Tukey's test

   smetab <- stack(metab) 

   names(smetab) <- c("length", "group") 

   smetab 

   av1<-aov(length ~ group, data=smetab) 

   summary(av1) 

   tk<- TukeyHSD(av1) 

   tk