Kaplan-Meier for left truncated data?

I have got two late answers to this question, from Mai Zhou and Bendix
Carstensen. Both point out a 'trick': Use  coxph  to fit a model with
no covariates and ask for the 'baseline hazard' of that fit!  
Unlike  survfit,  coxph  allows for left truncated data.

Thanks to both!

G?ran

On Sun, 21 May 2000, gb wrote:

Is there a function somewhere for estimating the survivor function
(plus confidence limits) when data are both left truncated and right
censored?  survfit in  survival5  doesn't like left truncation.

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