por sinal, nao consigo reproduzir... para comparacao:

> sessionInfo()
R Under development (unstable) (2011-07-29 r56541)
Platform: x86_64-apple-darwin9.8.0/x86_64 (64-bit)

locale:
[1] C

attached base packages:
[1] splines   stats     graphics  grDevices datasets  utils
methods   base

other attached packages:
[1] rms_3.3-1            Hmisc_3.8-3          epicalc_2.13.1.4
nnet_7.3-1
[5] MASS_7.3-14          survival_2.36-9      foreign_0.8-46
RColorBrewer_1.0-5
[9] BiocInstaller_1.1.28

loaded via a namespace (and not attached):
[1] cluster_1.14.0  grid_2.14.0     lattice_0.19-33 tools_2.14.0
>
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