[R] Parametric survival models with left truncated, right censored data

[Beth Ireland]

Dear All,

I would like to fit some parametric survival models using left
truncated, right censored data in R. However I am having problems
finding a function to fit parametric survival models which can handle
left truncated data.

I have tested both the survreg function in package survival: 

fit1 <- survreg(Surv(start, stop, status) ~ X + Y + Z, data=data1)

and the psm function in package Design: 

fit2 <- psm(Surv(start, stop, status) ~ X + Y + Z, data=data1)


But neither function appears to work with left truncated data. The error
message "Invalid survival type" is received for both functions when left
truncated data is specified.

The function weibreg in the eha package fits Weibull survival models and
works with left truncated data. This function is useful, but I need to
fit parametric models other than Weibull.

Any suggestions of functions that can fit parametric survival models
other than Weibull on left truncated, right censored data would be
greatly appreciated.

Kind Regards,

Beth 
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