Perhaps there are multiple versions of oswego.rec. I think I am using the original EPI6 copy, where ILL and all of the food exposures are coded as <Y>. In my hands, TAB ILL VANILLA gives the correct RR - at the bottom of the tables, we see that this is RR for ILL=Y given VANILLA=Y (with V2, Build 126). In previous builds of V1, you needed to include /sd to get the Y/N in the correct order.
Jamie
epidata-list@lists.umanitoba.ca wrote:
For those who will do outbreak investigations, you have to be careful: Using Oswega.rec data you will get wrong estimates of attac rates and RR, using tab ill cakes vanilla chocolate /oa /ex
To get the right results, you have to use tab ill cakes vanilla chocolate /oa / sd /ex
There are a bug in the tab command. In statified analysis the adjusted RR is correct, also the estimated MH-chisq and p-value. However, the degree of freedom (Df) of the MH estimator is wrong: To demonstrate the case use tab ill vanilla sex /rr / sd/ t
Despite these considerations, thanks for the new version.
Egil Arnesen Institute of community medicine, University of Tromsø, Norway.
-----Opprinnelig melding----- Fra: epidata-list-bounces@lists.umanitoba.ca [mailto:epidata-list-bounces@lists.umanitoba.ca]På vegne av epidata-list@lists.umanitoba.ca Sendt: 8. november 2007 02:16 Til: epidata-list@lists.umanitoba.ca Kopi: Lee Lior Emne: [EpiData-list] Analysis V2 - Congratulations
Although there are a few minor bugs, these will usually be very obvious and only in the unusual situation. My quick testing on favourite troublesome data sets shows this is a great release.
If you know anyone working on outbreak investigations who has not seen Analysis, do them a favour and show them how to do the following on the OSWEGO.REC data:
tab ill cakes vanilla chocolate /oa /ex gen i onset=(onsettime div 100) + iif(onsetdate = "04/19",24,0) epicurve onset ill
You will make someone very happy, I'm sure. Many of us working in the field have been waiting for something as simple as this (I have been waiting over 25 years). Sure, you could almost do this in EPI6, but only with a lot of advanced knowledge - and forget the exact test except as table by table.
Many thanks to Jens & team!!
Jamie Hockin Public Health Agency of Canada _______________________________________________ EpiData-list mailing list EpiData-list@lists.umanitoba.ca http://lists.umanitoba.ca/mailman/listinfo/epidata-list _______________________________________________ EpiData-list mailing list EpiData-list@lists.umanitoba.ca http://lists.umanitoba.ca/mailman/listinfo/epidata-list