[R] 3 or 4 level Split plot

[Gruppo Tappeti Erbosi]

As an agronomist, sometimes i need to perform statistical analisys on 
"weird" field data, like 3 or 4 level split plot design.

I've read both the help of the program, some books and manual about S and 
"Venables/Ripley, Modern Applied Statistics with S", but i still have 
problems in (i suppose) formulae sintax.

I'm trying to perform AOV, as explained showed in "Random and Mixed 
Effects", chapter 10, V./R., on a data set i collected on turf root density 
under different turf species, substrates, fertilisation and sampling 
depht.  ..and 12 replicates
So, on a general formulation, i have a response factor, say, Roots, 
treatmens T1, T2, T3 and T4, and Rep replicates, organized on a four levels 
split plot design.
I have an old gwbasic program, simple and time tested, that can calculate 
the analisys of variance of 3 levels split plot experiment, and when i 
compare his output whit the results obtained with R, i find that i 
(probably) fail to define the nesting effect of the split plot design.

Can anyone suggest me how to specify the response and error term in the aov 
formula?

Thank in advance

Gruppo Tappeti Erbosi
Dipartimento Produzione Vegetale
Università degli Studi della Tuscia
Viterbo - Italy
+ 39 0761 357541


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