[R] Nested Designs

[Peter Dalgaard BSA]

"Alan T. Arnholt" <arnholt at math.appstate.edu> writes:

> > Hmm. You're not giving us any data to try it on, but I think I'd have
> > 
> > aov(Strain~Machine + Error(Machine:Head))

> Here is the data I am using:
> 
> > strain
>    Strain Head Machine
> 1       6    A       A
....
> 80      0    D       E
> 
> Your suggestion gives
> > summary(aov(Strain~Machine + Head%in%Machine + Error(Machine:Head)))
> 
> Error: Machine:Head
>              Df  Sum Sq Mean Sq
> Machine       4  45.075  11.269
> Machine:Head 15 282.875  18.858
> 
> Error: Within
>           Df Sum Sq Mean Sq F value Pr(>F)
> Residuals 60  642.0    10.7    
> 
> Unfortunately no F-values.....

But that's not what I said:

> summary(aov(Strain~Machine + Error(Machine:Head)))

Error: Machine:Head
          Df  Sum Sq Mean Sq F value Pr(>F)
Machine    4  45.075  11.269  0.5975   0.67
Residuals 15 282.875  18.858               

Error: Within
          Df Sum Sq Mean Sq F value Pr(>F)
Residuals 60  642.0    10.7               


-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)             FAX: (+45) 35327907
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