[R] Projecting Survival Curve into the Future

2008-09-04 Thread Alan Cox
Hello, I have a survivor curve that shows account cancellations during the past 3.5 months.  Fortunately for our business, but unfortunately for my analysis, the survivor curve doesn't yet pass through 50%.  Is there a safe way to extend the survivor curve and estimate at what time we'll hit

Re: [R] Projecting Survival Curve into the Future

2008-09-04 Thread Richard . Cotton
> I have a survivor curve that shows account cancellations during the > past 3.5 months. Â Fortunately for our business, but unfortunately > for my analysis, the survivor curve doesn't yet pass through 50%. > Â Is there a safe way to extend the survivor curve and estimate at > what time we'll h

Re: [R] Projecting Survival Curve into the Future

2008-09-04 Thread Robert A LaBudde
You might consider a probit analysis using ln(Time) as the "dose". At 09:24 AM 9/4/2008, [EMAIL PROTECTED] wrote: > I have a survivor curve that shows account cancellations during the > past 3.5 months. Â Fortunately for our business, but unfortunately > for my analysis, the survivor curve doesn

Re: [R] Projecting Survival Curve into the Future

2008-09-04 Thread Prof Brian Ripley
On Thu, 4 Sep 2008, [EMAIL PROTECTED] wrote: I have a survivor curve that shows account cancellations during the past 3.5 months. Â Fortunately for our business, but unfortunately for my analysis, the survivor curve doesn't yet pass through 50%. Â Is there a safe way to extend the survivor curve