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Re: st: survival analysis


From   martine etienne <martieluvsu@yahoo.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: survival analysis
Date   Fri, 15 Oct 2010 11:01:01 -0700 (PDT)

No problem Steve,
Thanks for trying to help.



----- Original Message ----
From: Steve Samuels <sjsamuels@gmail.com>
To: statalist@hsphsun2.harvard.edu
Sent: Fri, October 15, 2010 1:52:45 PM
Subject: Re: st: survival analysis

Martine-

First of all I apologize for misspelling your name in my first post.

I've seen survival analysis applied to suppression data, but it's not
simple.  I'm afraid that I don't have sufficient knowledge in this
area to advise you. If you are at a medical center, perhaps the
statisticians can help or point you in the right direction.

Best of luck,

Steve

Steven J. Samuels
sjsamuels@gmail.com
18 Cantine's Island
Saugerties NY 12477
USA
Voice: 845-246-0774
Fax:    206-202-4783


On Fri, Oct 15, 2010 at 1:25 PM, martine etienne <martieluvsu@yahoo.com> wrote:
> thank you Steve,
> 1. the event of interest is viral suppression=1, the event could only happen 
>one
> time, but because there are a few patients with repeated measure of viral
> suppression it may have happened more than once
> 2. yes, to question number 2
> 3. yes for question number 3
> 4. No, I have time 2 for all patients
>
> thanks for you help
>
>
>
>
>
> ----- Original Message ----
> From: Steve Samuels <sjsamuels@gmail.com>
> To: statalist@hsphsun2.harvard.edu
> Sent: Fri, October 15, 2010 11:59:23 AM
> Subject: Re: st: survival analysis
>
> Martine Ettiene:
>
> This sounds like a "cohort" of patients who were defined at time 1 and
> about whom information was gathered at time 2
>
> Some questions to clarify your problem:
>
> 1. What was the event of interest?   Could the event have happened
> more than once to a patient?
>
> 2. When you say, "retrospective", do you mean that, if the event took
> place between time 1 and time 2 you have the date?
>
> 3. Are there any patients for which the only information is that the
> event took place between time 1 and time 2, but the dates are
> uncertain (e.g. you have only month) or missing?
>
> 4. Are there patients for whom you have _no_ information at time 2?
>
> For your information:  Our program is spelled "Stata", not "STATA"
> (see section 8.2 of the FAQ).
>
> Steve
>
> Steven J. Samuels
> sjsamuels@gmail.com
> 18 Cantine's Island
> Saugerties NY 12477
> USA
> Voice: 845-246-0774
> Fax:    206-202-4783
>
>
> On Fri, Oct 15, 2010 at 11:23 AM, martine etienne <martieluvsu@yahoo.com> 
>wrote:
>> Dear Statalist,
>>
>> I have a question about using survival analysis in STATA. I have a
>> cross-sectional dataset (of patients on a particular regimen from time 1 to
>>time
>> 2).  The thing I'm unsure about is my time 2 which is really the date of the
>> cross-sectional data collection. I have previous dates going back
>> retrospectively from cross-sectional data analysis to date 1.
>>
>> Can I use survival analysis with this cross-sectional data?
>> thanks,
>> Martine
>>
>>
>>
>>
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