> R-ouput
>
> Df Sum Sq Mean Sq F value
> Pr(>F)
> treatment 3 14015 4672 65.021 < 2e-16
> ***
> variety 3 5883 1961 27.295
> 2.95e-12 ***
> treatment:variety 9 5474 608 8.465 8.93e-09
> ***
> soilgroup -missing
> treatment:variety:soilgroup - missing
> Here, I am missing value of soil group and interation of treatment: variety:
> soilgroup- Can any one please tell me why?
Do the lines
> soilgroup -missing
> treatment:variety:soilgroup - missing
Actually appear in your output? If so, I have no idea.
But if the terms are simply absent, one possibility is that soilgroup is
completely confounded with an earlier factor in the model and therefore
unidentifiable. aov seems fairly tolerant of that in one sense - instead of
throwing an error and stopping it tells you what it can identify and leaves out
anything it can't.
S Ellison
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