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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 17:14:46 +0900 |

Thanks, Maarten ______________________________________________ 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 Maarten buis Sent: Friday, 16 November 2007 4:37 PM To: statalist@hsphsun2.harvard.edu Subject: RE: st: What is this problem called? --- Kieran McCaul <kamccaul@meddent.uwa.edu.au> wrote: > 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. This seems to be a hetroscedastic model, have a look at chapter 10 of (McCullagh & Nelder 1989). A similar model that deals with discrete or ordinal data is sometimes called a hetregeneous choice models, this is discussed here: http://www.nd.edu/~rwilliam/oglm/index.html P. McCullagh, John A. Nelder (1989), "Generalized Linear Models", Second Edition, Chapman & Hall/CRC. Hope this helps, Maarten ----------------------------------------- Maarten L. Buis Department of Social Research Methodology Vrije Universiteit Amsterdam Boelelaan 1081 1081 HV Amsterdam The Netherlands visiting address: Buitenveldertselaan 3 (Metropolitan), room Z434 +31 20 5986715 http://home.fsw.vu.nl/m.buis/ ----------------------------------------- ___________________________________________________________ Yahoo! Answers - Got a question? Someone out there knows the answer. Try it now. http://uk.answers.yahoo.com/ * * 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/

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

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

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