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From |
Michael Foster <mike4kids@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: What is this problem called? |

Date |
Sat, 17 Nov 2007 11:28:16 -0500 |

Hi Kiernan,

The key issue is what constitutes "stabilizes"--to me, that sounds like a time series problem. I'm not a time series expert (really, I'm a time series ignoramus). What I would do, though, is look in a time-series book to find a way to determine a test for stability then look at how adding time points affects this test.

Presumably from the first to the second surgery and so on, you could reject stability. Then by the kth, you no longer could do so-

something like that--michael

Kieran McCaul wrote:

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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**References**:**st: What is this problem called?***From:*"Kieran McCaul" <kamccaul@meddent.uwa.edu.au>

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