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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 > _______________________________________________ > > > > > * > * For searches and help try: > * http://www.stata.com/support/faqs/res/findit.html > * http://www.stata.com/support/statalist/faq > * http://www.ats.ucla.edu/stat/stata/ * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/ * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**Re: st: What is this problem called?***From:*"Austin Nichols" <austinnichols@gmail.com>

**RE: st: What is this problem called?***From:*Maarten buis <maartenbuis@yahoo.co.uk>

**References**:**Re: st: What is this problem called?***From:*Hind Sbihi <sbihi@interchange.ubc.ca>

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