Notice: On April 23, 2014, Statalist moved from an email list to a forum, based at statalist.org.
| From | Marcos Vinicius <bioestatistico@inbox.com> |
| To | statalist@hsphsun2.harvard.edu |
| Subject | Re: st: scoring system using marginally significant predictors |
| Date | Thu, 14 Mar 2013 09:50:52 -0800 |
Internal validation was performed using bootstrap > -----Original Message----- > From: dspady@ualberta.ca > Sent: Thu, 14 Mar 2013 11:39:27 -0600 > To: statalist@hsphsun2.harvard.edu > Subject: Re: st: scoring system using marginally significant predictors > > Did you split your population and test the prediction based on one half, > against the other (unpredicted) half. Just depending on statistics to > provide a scoring system, rather than also maybe using biologically > plausible factors (e.g. sex, age staging etc) even if not statistically > significant seems to me not a good approach. > > Don > On 2013-03-14, at 11:26 AM, Marcos Vinicius <bioestatistico@inbox.com> > wrote: > >> Hello , >> I would like to share a strategy and have your opinion. >> Backward elimination was used to reach the final multivariate logistic >> regression model using p<0.10 as entry and stay level From the final >> model We then created a weighted scoring system by rounding all >> regression coefficients up to the nearest integer (ie, the smallest >> integer greater than the estimate). This method was based on the beta >> coefficients >> Once the final model was defined, we created integer weights for each >> variable. We calculated these weights by multiplying the model >> coefficients by 10.As like the article below we considered the >> statistically significant predictors and also the marginally significant >> predictors (0.05<p<0.10 ) to determine the scoring system. >> >> Is it ok or the scoring system should be strictly derivated using only >> statistically significant predictors? >> Thanks, >> Ann Thorac Surg. 2008 Jun;85(6):1938-45. doi: >> 10.1016/j.athoracsur.2008.03.014. >> Preoperative prediction of the occurrence and severity of complications >> after esophagectomy for cancer with use of a nomogram >> Thanks, >> Vinicius >> >> ____________________________________________________________ >> FREE 3D MARINE AQUARIUM SCREENSAVER - Watch dolphins, sharks & orcas on >> your desktop! >> Check it out at http://www.inbox.com/marineaquarium >> >> >> >> * >> * 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/ >> > > Donald Spady > > -- > dspady@ualberta.ca > > > > > > * > * 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/ ____________________________________________________________ Send any screenshot to your friends in seconds... Works in all emails, instant messengers, blogs, forums and social networks. TRY IM TOOLPACK at http://www.imtoolpack.com/default.aspx?rc=if2 for FREE * * 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/