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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,

...single observation in the data frame to save space. This is the assumption of survfit. (Most readers of this list will be too young to remember when computer memory was so small that we had to use tricks like this.) The second assumption is that the weights are sampling weights and a Horvitz-Thompsen like estimator should be used for variance. This is the assumption of the svykm program in the survey package. It appears you want the second behavior. Terry Therneau On 03/26/2013 06:00 AM, r-help-request at r-project.org wrote: > As part of a research paper, I would like to draw both wei...