Hi all,
I'm trying to perform a nested ANOVA, in which "Rewetted" is the main
factor and "Position" is a fixed factor nested in "Location". I'm
interested in the effect of "Rewetting" and "Position" on the dependent
variable (in this case called N), and also in the interaction between these
factors. I tried finding this using this script:
summary(aov(data=data1, N~Rewetted*Location+Error(Position/Location))
This yielded the following output:
Error: Position
Df Sum Sq Mean Sq F value Pr(>F)
Residuals 2 0.1625 0.08125
Error: Position:Location
Df Sum Sq Mean Sq F value Pr(>F)
Rewetted 1 29.65 29.650 5.664 0.0321 *
Location 6 42.61 7.102 1.357 0.2975
Residuals 14 73.29 5.235
---
Signif. codes: 0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1
Error: Within
Df Sum Sq Mean Sq F value Pr(>F)
Residuals 48 109.9 2.289
As you can see, there is no P-value for Error: position, so I can't say
what the effect of Position is. According to my supervisor this is because
something in the formulation of the script is wrong, but he won't tell me
what (or he doesn't actually know...). What should I change?
Thanks,
Annette
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