survreg allows interval censored data, if that is how you want to represent 
measurement uncertainty.  See

?Surv

-----Original Message-----
From: Kyle Penner [mailto:kpen...@as.arizona.edu] 
Sent: Tuesday, June 11, 2013 8:02 PM
To: r-help@r-project.org
Subject: [R] survreg with measurement uncertainties

Hello,

I have some measurements that I am trying to fit a model to.  I also have 
uncertainties for these measurements.  Some of the measurements are not well 
detected, so I'd like to use a limit instead of the actual measurement.  (I am 
always dealing with upper limits, i.e. left censored data.)

I have successfully run survreg using the combination of well detected 
measurements and limits, but I would like to include the measurement 
uncertainty (for the well detected measurements) in the fitting.  As far as I 
can tell, survreg doesn't support this.  Does anyone have a suggestion for how 
to accomplish this?

Thanks,

Kyle


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