#Biostatistics 290

#BALANCED TWO-WAY ANOVA
#FIXED EFFECTS (ANOVA MODEL I)
#ZAR EXAMPLE 12.1
ZAR=read.table("ZarEX12.1R.txt")
ZAR
attach(ZAR)
A=factor(treatment)
B=factor(sex)
Y=calcium
g=factor(group)
options(digits=9)


anova(lm(Y~A+B+A:B)) #FACTORS A,B PLUS A:B INTERACTION
anova(lm(Y~A*B))  # SIMPLER EQUIVALENT FORMULA