[R] Estimating Mean of a Poisson Distribution Based on interval censoring

Therneau, Terry M., Ph.D. therneau at mayo.edu
Mon Feb 15 13:38:21 CET 2016

For an interval censored poisson or lognormal, use survreg() in the survival package.  (Or 
if you are a SAS fan use proc lifereg).  If you have a data set where R and SAS give 
different answers I'd like to know about it, but my general experience is that this is 
more often a user error.  I am also curious to learn exactly what you mean by "interval 
censored poisson".  Exponential with interval time to first event is equivalent to 
poisson, which is what I'd guess from "lognormal", but you may mean something else.

Terry Therneau
(author of survival)

On 02/14/2016 05:00 AM, r-help-request at r-project.org wrote:
> Dear all,
> I appreciate that if you let me know if there is any package implemented in R for Estimating Mean of a Poisson Distribution Based on Interval censoring? And if yes, could you please provide some information about it:)?
> By the way, is there anything for lognormal?I think fitdistcens is not good for this purpose as it gives me different result compared to SAS and only useful for right/left censoring and not interval censoring?(or both left and right together).?
> Kind regards,Mohsen

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