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From |
Ronan Conroy <rconroy@rcsi.ie> |

To |
"statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu> |

Subject |
Re: st: RE: Reconstructing the distribution from interval data |

Date |
Mon, 13 Sep 2010 11:47:16 +0100 |

On 9 MFómh 2010, at 21:12, Kieran McCaul wrote:

My first thought when reading Ronan's original post was "If peoplewant to know how many procedures someone has performed in the lastyear, why don't they just ask them? Why do they group the responsesin the questionnaire?"

I suppose that by grouping the responses in the questionnaire, theauthors are tacitly acknowledging that there will be a degree oferror in recall of the exact number. If they had asked for theexact number, then I suspect the distribution would have displayedsome evidence of this; a tendency to report 5, 10, 15, etc. Thatwould still be better than grouping the responses in thequestionnaire though.With regard to the zeros. I suppose there are going to be a smallproportion of surgeons who have done a procedure in the past, butare not quite sure whether it was in the last year or not. So thereis likely to be some misclassification error, but probably small,probably non-differential.

Ronán Conroy Associate Professor Division of Population Health Sciences ================================= rconroy@rcsi.ie Royal College of Surgeons in Ireland Epidemiology Department, Beaux Lane House, Dublin 2, Ireland +353 (0)1 402 2431 +353 (0)87 799 97 95 +353 (0)1 402 2764 (Fax - remember them?) http://rcsi.academia.edu/RonanConroy P Before printing, think about the environment * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**References**:**st: Reconstructing the distribution from interval data***From:*Ronan Conroy <rconroy@rcsi.ie>

**st: RE: Reconstructing the distribution from interval data***From:*"David Radwin" <dradwin@mprinc.com>

**Re: st: RE: Reconstructing the distribution from interval data***From:*Austin Nichols <austinnichols@gmail.com>

**Re: st: RE: Reconstructing the distribution from interval data***From:*Ronan Conroy <rconroy@rcsi.ie>

**RE: st: RE: Reconstructing the distribution from interval data***From:*"Kieran McCaul" <Kieran.McCaul@uwa.edu.au>

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