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RE: st: What is this problem called?


From   "Kieran McCaul" <kamccaul@meddent.uwa.edu.au>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: What is this problem called?
Date   Fri, 16 Nov 2007 15:59:56 +0900

Thanks, but I don't think that this is a survival problem.  The interest
is not in the time it takes to perform a procedure, but the variation in
procedure times.  For example, if 200 procedures were performed, there
might be little difference in the average time for the first 50
procedure compared to the last 50 procedures.  I suspect, though, that
there might be a large difference in the variance of these times.  It's
the change in variance as more procedures are performed that's of
interested. 

______________________________________________
Kieran McCaul MPH PhD
WA Centre for Health & Ageing (M573)
University of Western Australia
Level 6, Ainslie House
48 Murray St
Perth 6000
email: kamccaul@meddent.uwa.edu.au
http://myprofile.cos.com/mccaul 
_______________________________________________


-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Hind Sbihi
Sent: Friday, 16 November 2007 2:39 PM
To: statalist@hsphsun2.harvard.edu
Subject: Re: st: What is this problem called?


Hello 

You might want to try the literature on survival time analyses.
There is an amazing resource by Pr. Singer on questions more or les
related to the type of issue you raised. the URL for a webpage is
http://www.gse.harvard.edu/~faculty/singer/

Happy reading.
Hind Sbihi

-----Original Message-----

> Date: Thu Nov 15 21:01:21 PST 2007
> From: "Kieran McCaul" <kamccaul@meddent.uwa.edu.au>
> Subject: st: What is this problem called?
> To: statalist@hsphsun2.harvard.edu
>
> Gidday,
> 
> A colleague has asked me the following question:
> 
> Suppose a surgeon performs a number of surgical procedures using a new
> technique.  He/she records the operating time for each operation.  How
> would the data be analysed so as to determine the number of procedures
> performed before the operating time stabilises?
> 
> I haven't come across a problem quite like this before, but it seems
to
> me that it's a question that might arise, for example, when evaluating
> the implementation of new industrial or manufacturing processes.
> 
> I have an idea about how I would approach this analysis, but first I'd
> like to have a look at what others may have done.
> 
> Searching the literature is difficult though if you don't know what
the
> problem is called.
> 
> Does anyone recognise this problem or something analogous to it and
can
> you give me a name I can search on or point me to a few relevant
papers.
> I can back-track though the literature from there.
> 
> Thanks in advance,
> 
> Kieran
> 
> ______________________________________________
> Kieran McCaul MPH PhD
> WA Centre for Health & Ageing (M573)
> University of Western Australia
> Level 6, Ainslie House
> 48 Murray St
> Perth 6000
> email: kamccaul@meddent.uwa.edu.au
> http://myprofile.cos.com/mccaul 
> _______________________________________________
> 
> 
> 
> 
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