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From |
Richard Goldstein <richgold@ix.netcom.com> |

To |
statalist@hsphsun2.harvard.edu |

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

Date |
Fri, 16 Nov 2007 08:36:54 -0500 |

At least as stated, this is the inverse of the traditional statistical quality control problem; traditionally, a process is in control and one uses QC to find, as fast as possible, when the process goes out of control. You appear to start out of control and want to know when the process become in control.

I don't know if this question has been examined in the QC literature, but my guess it that it has and I would do a lit search there.

Hope this helps,

Rich

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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**Follow-Ups**:**Thanks - RE: st: What is this problem called?***From:*"Kieran McCaul" <kamccaul@meddent.uwa.edu.au>

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

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