BIOL361 Lecture Notes - Lecture 14: Error Bar, John Tukey, Dependent And Independent Variables
24 Apr 2016
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1- way categorized subjects according to 1 factor. 2- way subjects are allocated into groups representing the different possible combinations of 2 factors. Testing if oxygen consumption rate of limpets differs between 2 species of limpets and among 3 diff concentrations of seawater. If you do 2 1-way anovas then you waste info and ignore any effects from an interaction among the 2 factors. But 2-way anova is more complicated to understand due to the possibility of interactions between the 2 factors. Interaction between 2 factors if the effect of one of the factors changes for different levels of the other factor. Interaction when an effect is larger or smaller than would be predicted based on the main effects of the individual factors. Effect of 4 diff teaching methods to 3 diff types of students (hs, undergrads, grad students) 2-way asks 3 questions and computes 3 p values.
