Nothing
ntaste <- data.frame(score = tastetest$score,
scr = as.numeric(tastetest$scr) - 1,
liq = as.numeric(tastetest$liq) - 1,
scrliq = ( as.numeric(tastetest$scr) -1 ) *
( as.numeric(tastetest$liq) -1 )
); ntaste
Omega <- lm(score~scr*liq,data=tastetest)
M <- model.matrix(Omega)
M2 <- cbind(M[,3], M[,2] - 2 * M[,4])
M3 <- cbind(M[,2], M[,3] - 2 * M[,4])
omega1 <- lm(score~scr+liq,data=tastetest)
omega2 <- lm(score~M2,tastetest)
omega2a <- lm(score~ liq + I(scr - 2 * scrliq),data=ntaste)
omega3 <- lm(score~M3,tastetest)
omega3a <- lm(score~ scr + I(liq - 2 * scrliq),data=ntaste)
anova(omega1,Omega) # test for interaction
# test main effect for scr
# anova(omega2a,Omega) # this gives the same result as line below
anova(omega2,Omega)
# test main effect for liq
# anova(omega3a,Omega) # this gives the same result as line below
anova(omega3,Omega)
Any scripts or data that you put into this service are public.
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.