Hello Drs. Colosimo and Harrell,
Thank you for your replies to my question. From Dr. Colosimo, I was able to
determine that the SAS results can be replicated by adding the
option conf.type="log-log" to my code as in :
survobj <- survfit(survfrm, conf.type="log-log", data=Survival)
Originally, it looked like the SAS results could be replicated using
conf.type="plain". Applying this option to my actual data revealed that this
was not the case, however.
>From Dr. Harrell, I learned that using conf.type="log-log" may not be such a
>good idea. Interestingly though, I've seen at least one instance where experts
>in the R community use this option in their book. The book is about 10 years
>old. So maybe opinion about the use of this option has shifted since then.
Thanks,
Paul
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