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| From | Ronan Conroy <rconroy@rcsi.ie> |
| To | "<statalist@hsphsun2.harvard.edu>" <statalist@hsphsun2.harvard.edu> |
| Subject | Re: st: RE: P-values for the difference in sensitivity in metandi |
| Date | Wed, 26 Mar 2014 16:24:17 +0000 |
Prof. Ronan Conroy Associate Professor of Biostatistics RCSI Department of Epidemiology and Public Health Medicine Royal College of Surgeons in Ireland Lower Mercer Street, Dublin 2, Ireland T: 01-402-2431 E: rconroy@rcsi.ie W: www.rcsi.ie RCSI DEVELOPING HEALTHCARE LEADERS WHO MAKE A DIFFERENCE WORLDWIDE On 2014 Márta 25, at 19:38, Carole Lunny wrote: > Dear Joe, > > I am comparing self-collected samples compared to the gold standard > clinician-collected samples. The confidence intervals for absolute > sensivity and specificity will always be positive and withing the > range 0.1 - 1.0, so this is not a way to tell is it is statistically > significant. To have a statistical test you must be able to specify a credible null hypothesis. The question, I think, is how well patients agree with doctors, not whether they agree at all. So we are talking about measures of effect size and their confidence intervals. I cannot think of a null hypothesis to test here. Ronán Conroy rconroy@rcsi.ie Associate Professor Division of Population Health Sciences Royal College of Surgeons in Ireland Beaux Lane House Dublin 2 * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/faqs/resources/statalist-faq/ * http://www.ats.ucla.edu/stat/stata/