[R] 'rms' package error

Pascal Oettli kridox at ymail.com
Thu Apr 3 06:36:36 CEST 2014

Hello Lucy,

If you carefully read, it is is not an error message, but a warning
message. It tells you that for the moment, if I am not mistaken,
"pphsm" does not return the correct covariance matrix, for any


On Thu, Apr 3, 2014 at 11:29 AM, Lucy Leigh <lucy.leigh at newcastle.edu.au> wrote:
> Hi everyone,
> I am attempting to use the R package 'rms'
> http://biostat.mc.vanderbilt.edu/wiki/Main/Rrms
> to implement a PH weibull model, using the pphsm() function.
> However, I get the following error,
> f.ph <- pphsm(f)
> Warning message:
> In pphsm(f) :
>   at present, pphsm does not return the correct covariance matrix
> I tried simply running the example on page 117 of the manual, i.e.
> set.seed(1)
> S <- Surv(runif(100))
> x <- runif(100)
> dd <- datadist(x); options(datadist='dd')
> f <- psm(S ~ x, dist="exponential")
> summary(f) # effects on log(T) scale
> f.ph <- pphsm(f)
> ## Not run: summary(f.ph)
> But I still got the above error message.
> I have looked through the R help archives, and it appears that this question has been asked before in 2011, but
> there were no replies.
> http://r.789695.n4.nabble.com/HELP-td3494640.html
> Does anyone know how to get this function to work? Or if there is an alternative package that can implement
> a Weibull PH model?
> Cheers,
> Lucy
>         [[alternative HTML version deleted]]
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Pascal Oettli
Project Scientist
Yokohama, Japan

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