Intertidal Algae
Area coverage of red algae (Mazzaella parksii) in two herbivore
treatments (herbivores) at two tide levels (height).
A data frame with 64 observations on the following 3 variables.
a factor with levels low and
mid
a factor with levels minus and
plus
a numeric vector
Harley, C.D.G. 2003. Individualistic vertical responses of interacting species determine range limits across a horizontal gradient. Ecology 84: 1477-1488.
str(IntertidalAlgae) # Using * includes the main effects and the interaction aov.fit <- aov(sqrt.area ~ herbivores * height, data = IntertidalAlgae) summary(aov.fit) lm.fit <- lm(sqrt.area ~ herbivores * height, data = IntertidalAlgae) anova(lm.fit)
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