On Sat, 12 Aug 2006, takahashi kohske wrote:
Dear list members:
I'd like to one-way repeated measured anova by using mlm.
I'm using R-2.3.1 and my code is:
dat-matrix( c(9,7,8,8,12,11,8,13, 6,5,6,3,6,7,10,9,
10,13,8,13,12,14,14,16, 9,11,13,14,16,12,15,14),
ncol=4, dimname=list(s=1:8, c=1:4))
mlmfit-lm(dat~1)
anova(mlmfit, X=~1)
Error: ceiling(length.out) : Non-numeric argument to mathematical function
this error occurs in anova.mlm
if (rk 0) {
p1 - 1:rk
comp - object$effects[p1, ]
asgn - object$assign[object$qr$pivot][p1]
nmeffects - c((Intercept), attr(object$terms,
term.labels))
tlabels - nmeffects[1 + unique(asgn)]
ix - split(seq(length = nrow(comp)), asgn) #HERE
ss - lapply(ix, function(i) crossprod(comp[i, ,
drop = FALSE]))
df - sapply(split(asgn, asgn), length)
}
because nrow(comp) returns NULL.
in my memory, R-2.2.* ( or may be R-2.3.0) can correctly handle this code.
so, I think this is a kind of side-effect of fixing PR#8679.
currently, i can workaround as follows:
anova(mlmfit, update(mlmfit, ~0), X=~1)
this code returns correct answer.
I don't know whether this behavior is correct or bug.
Yes, it is a bug. The line
comp - object$effects[p1, ]
should be
comp - object$effects[p1, , drop=FALSE]
I am changing this in 2.3.1 patched and R-devel.
--
Brian D. Ripley, [EMAIL PROTECTED]
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272866 (PA)
Oxford OX1 3TG, UKFax: +44 1865 272595
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