> > I have several datasets, all left-truncated at x=1, that I am
attempting
> > to fit distributions to (lognormal, weibull and exponential). I had
> > been using fitdistr in the MASS package as follows:
> A possible solution is to use the survreg() in the survival package
> without specifying the covariates, i.e.
>
> library(survival)
> survreg(Surv(..)~1, dist="weibull")
>
> where Surv(..) accepts information about "times", censoring/truncation
> variables and dist allows to specify alternative distributions.
> See ?Surv e ?survreg
The survival package is mostly targeted at right-censored data. The NADA
package provides wrappers for many of the survival routines so they work
with left-censored data.
Regards,
Richie.
Mathematical Sciences Unit
HSL
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