[R] model.tables standard errors

iwhite at staffmail.ed.ac.uk iwhite at staffmail.ed.ac.uk
Thu Jul 17 11:49:03 CEST 2008

Not sure how to interpret standard errors produced by

model.tables(object, type="effects", se=T)

For example, simplest possible case is single stratum anova with two 
equally replicated treatments (n observations each). The effects displayed
are plus and minus half the difference between the two treatment means,
and the SE is given as sqrt(RMS/n), where RMS = residual mean 
square. But the usual calculation would give the SE as this divided by

Can't see this question raised previously in the archives, so perhaps I am 
missing something basic here.

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