نتایج جستجو برای: شاخص roc

تعداد نتایج: 92576  

Journal: :The Stata journal 2009
Margaret Pepe Gary Longton Holly Janes

The receiver operating characteristic (ROC) curve displays the capacity of a marker or diagnostic test to discriminate between two groups of subjects, cases versus controls. We present a comprehensive suite of Stata commands for performing ROC analysis. Non-parametric, semiparametric and parametric estimators are calculated. Comparisons between curves are based on the area or partial area under...

Journal: :Journal of the American College of Radiology : JACR 2006
Charles E Metz

Receiver operating characteristic (ROC) analysis provides the most comprehensive description of diagnostic accuracy available to date, because it estimates and reports all of the combinations of sensitivity and specificity that a diagnostic test is able to provide. After sketching the 6 levels at which diagnostic efficacy can be assessed, this paper explains the conceptual foundations of conven...

Journal: :journal of dental school, shahid beheshti university of medical sciences 0
z. jaberi ansari dept. of restorative dentistry, school of dentistry, shahid beheshti university of medical sciences, tehran, iran. s. valizadeh dept. of oral & maxillofacial radiology, school of dentistry, shahid beheshti university of medical sciences, tehran, iran. z. hosseini dept. of orthodontics, school of dentistry, shahid beheshti university of medical sciences, tehran, iran. a. ghaznavi dept. of oral & maxillofacial radiology, school of dentistry, urmia university of medical sciences, urmia, iran.

objective: when none of digital systems and scanners is accessible and it is essential to have digitized images of conventional radiographs, digital cameras can be used. the aim of this study was to investigate whether digital images obtained by different resolutions of a digital camera are matched to the original radiographs in evaluation of caries. methods: in this diagnostic accuracy in vitr...

2012
Han-Cheng Yeh Teng-Chih Chao Hsiao-Wen Zan

Department of Photonics and The Institute of Electro-Optical Engineering, National Chiao Tung University, Hsinchu 300, Taiwan, ROC b Institute of Physics, National Chiao Tung University, Hsinchu 300, Taiwan, ROC Department of Materials Science and Engineering, National TsingHua University, Hsinchu 300, Taiwan, ROC Material and Chemical Research Laboratories, Industrial Technology Research Insti...

در دهه­های اخیر با گسترش فعالیت­های بشر در محیط طبیعی، انواع مخاطرات ازجمله زمین‌لغزش، آسیب­های جدی مالی و جانی به همراه داشته است. درنتیجه بررسی حساسیت وقوع زمین‌لغزش و تعیین مناطق بحرانی جهت عملیات محافظتی و آبخیزداری ضروری به نظر می­رسد. در این تحقیق، حساسیت زمین‌لغزش با استفاده از تلفیق روش­های فازی و فرایند تحلیل شبکه­ای (ANP) در حوزه فاروب رومان مدل‌سازی گردید. برای انجام تحقیق، چهار خوشه...

Journal: :iranian red crescent medical journal 0
hamid alavi majd department of biostatistics, school of paramedical sciences, shahid beheshti university of medical sciences, tehran, ir iran ahmad reza baghestani department of biostatistics, school of paramedical sciences, shahid beheshti university of medical sciences, tehran, ir iran; department of biostatistics, school of paramedical sciences, shahid beheshti university of medical sciences, tehran, ir iran. tel: +98-2122707347, fax: +98-2122707347 nasrin broumandnia department of biostatistics, school of paramedical sciences, shahid beheshti university of medical sciences, tehran, ir iran nourossadat kariman research institute for reproductive health, faculty of nursing and midwifery, shahid beheshti university of medical sciences, tehran, ir iran nastaran safavi ardebili international branch of shahid beheshti university of medical sciences, tehran, ir iran elham sajjadi department of hematology, tarbiat modares university, tehran, ir iran ,

background identification of a normal range for biomarkers, based on pregnancy outcomes (caused by their high or low values) is of special importance in clinical studies. as some pregnancy outcomes can happen in both high and low levels of biomarkers, the receiver-operating characteristic (roc) curve is unsuitable for identifying these levels separately; rather, a statistical method is preferab...

ژورنال: :علوم آب و خاک 0
حمیدرضا پورقاسمی h. r. pourghasemi حمیدرضا مرادی h. r. moradi مجید محمدی m. mohammdi رئوف مصطفی زاده r. mostafazadeh عباس گلی جیرنده a. goli jirandeh

هدف از تحقیق حاضر پهنه بندی خطر زمین لغزش با استفاده از تئوری بیزین در بخشی از استان گلستان است. به این منظور ابتدا با استفاده از نقاط لغزشی بانک اطلاعات زمین لغزش کشور (392 نقطه لغزشی) نقشه پراکنش زمین لغزش های منطقه تهیه گردید. سپس نقشه های هر یک از عوامل مؤثر بر وقوع زمین لغزش مانند درجه شیب، جهت شیب، شکل شیب، ارتفاع، کاربری اراضی، زمین شناسی، فاصله از جاده، فاصله از آبراهه، فاصله از گسل، شا...

2003
Peter A. Flach

Many different metrics are used in machine learning and data mining to build and evaluate models. However, there is no general theory of machine learning metrics, that could answer questions such as: When we simultaneously want to optimise two criteria, how can or should they be traded off? Some metrics are inherently independent of class and misclassification cost distributions, while other ar...

2008
Dorel Lucanu Gheorghe Grigoraş

ROC! is a deterministic rewrite strategy language which includes the rewrite rulesas basic operators, and the deterministic choice and the repetition as high-level strategyoperators. In this paper we present a method which, for a given term rewriting system(TRS) R, constructs a new TRS R such that R-rewriting is equivalent (sound and com-plete) with R-rewriting constrained by RO...

پیشرفت و بهبود پیش بینی های عددی ، موجب توجه بیش از پیش برنامه ریزان و بهره برداران سیستم های منابع آب به این اطلاعات شده است. اغلب ارزیابی ها در زمینه پیش بینی های فصلی ، بر مبنای داده های ایستگاهی زمینی و یا داده های شبکه بندی صورت می گیرد. در این تحقیق در راستای ارزیابی عملکرد پیش بینی مدل CFSv2 ،تحلیل‌ها در مقیاس حوضه آبریز انجام شده است و به منظور ایجاد یک سری زمانی با طول دوره مناسب جهت ت...

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