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From | Haluk Vahaboglu <vahabo@hotmail.com> |
To | "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu> |
Subject | st: Collect and combine CIs of ROC curves from bootstrapped datasets |
Date | Thu, 28 Nov 2013 14:53:18 +0000 |
Dear Stata listers, I am using Stata 12.1 for Linux 64. I am trying to generate a predictive scale for a binary outcome (coded as 1/0). My dataset includes 507 patients with 169 events. Eventually, I selected independent variables from a logistic model and developed a scale by giving ranks to eight variables. To validate internally the performance of this scale, I generate ROC curve and compare AUC to the gold standard. Also I want to estimate limits of CIs by collecting and combining CIs from for example 10 rounds of bootstrapped datasets. For this purpose, I use -rocreg- command of Stata or a user written ado file -bsrintercept- (by H. Glick, http://www.uphs.upenn.edu/dgimhsr/stat-roc.htm). My question is, can I generate these bootstrapped datasets iteratively and collect AUCs and CIs by means of a loop (or whatever) and combine these. I am unfamiliar with the jargon used among statisticians and additionally not native. Probably it would be very difficult to understand what I am trying to say. However, I am in desperate need for a bit of help and would be grateful. Haluk Vahaboğlu Inf Dis & Clin Micro * * 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/