On 11 May 2008, at 22:45, Andrew Robinson wrote:
lme(y ~ selection * males, random = ~1|replica/selection/males,
mydata)
forgive me, but I seem to see nesting in the random statement.
That is
what happens when we separate factors with a '/'; they are nested. We
would expect that statement to not provide the correct df for the
bog-standard fully crossed design.
Please read page 23/24 of the Pinheiro and Bates book, "Mixed-Effects
Models in S and S-PLUS". It might prove enlightening.
F
--
Federico C. F. Calboli
Department of Epidemiology and Public Health
Imperial College, St. Mary's Campus
Norfolk Place, London W2 1PG
Tel +44 (0)20 75941602 Fax +44 (0)20 75943193
f.calboli [.a.t] imperial.ac.uk
f.calboli [.a.t] gmail.com
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