نتایج جستجو برای: prediction models

تعداد نتایج: 1108474  

Background and Objectives: Considering the importance of safety evaluation of fish and seafood from capture to purchase, rapid and nondestructive methods are in urgent need for seafood industry. This study aimed to assess the application of hyperspectral imaging (HSI: 430-1010 nm) for prediction of total volatile basic nitrogen (TVB-N) in Japanese-threadfin bream (Nemipterusjaponicus) fillets, ...

The prediction of economic series with high volatility and high uncertainty - such as natural gas prices - is always a challenge in econometric models, because the use of traditional linear modeling models does not allow us to predict complex and nonlinear time series. Regarding the prediction of natural gas prices,  findings point to superiority of the neural network compared to regression mod...

Journal: :international journal of endocrinology and metabolism 0
mahnaz barkhordari department of mathematics, bandar abbas branch, islamic azad university, bandar abbas, ir iran mojgan padyab centre for population studies, ageing and living conditions, umea university, umea, sweden farzad hadaegh prevention of metabolic disorders research center, research institute for endocrine sciences, shahid beheshti university of medical sciences, tehran, ir iran fereidoun azizi endocrine research center, research institute for endocrine sciences, shahid beheshti university of medical sciences, tehran, ir iran mohammadreza bozorgmanesh prevention of metabolic disorders research center, research institute for endocrine sciences, shahid beheshti university of medical sciences, tehran, ir iran; prevention of metabolic disorders research center, research institute for endocrine sciences, shahid beheshti university of medical sciences, p. o. box 19395-4763, tehran, ir iran. tel: +98-2122409301-5, fax: +98-2122402463

results the command is addpred for logistic regression models. conclusions the stata package provided herein can encourage the use of novel methods in examining predictive capacity of ever-emerging plethora of novel biomarkers. materials and methods we have written a stata command that is intended to help researchers obtain cut point-free and cut point-based net reclassification improvement ind...

Journal: :اکو هیدرولوژی 0
محمد ناظری تهرودی دانشجوی دکتری منابع آب، دانشکدۀ کشاورزی، دانشگاه بیرجند سید رضا هاشمی استادیار دانشکدۀ کشاورزی، دانشگاه بیرجند فرشاد احمدی دانشجوی دکتری منابع آب، دانشکدۀ علوم آب، دانشگاه شهید چمران اهواز زهرا ناظری تهرودی دانشجوی دکتری آبخیزداری، دانشکدۀ کشاورزی و منابع طبیعی، دانشگاه کاشان

prediction the river flow discharge values are important in the surface water resources management. find an appropriate model to accurately predictionof this parameter is one of the most important ways to simulation and prediction. in this study three anfis, svm and gp models were evaluated and compared to modeling the monthly flow discharge of nazloochi river in tapik hydrometric station that ...

Journal: :caspian journal of chemistry 2014
mohammad h fatemi ameneh kerdarshad elham gholami rostami

in this work quantitative structure activity relationship (qsar) methodology was applied for modeling and prediction of cellular response to polymers that have been designed for tissue engineering. after calculation and screening of molecular descriptors, linear and nonlinear models were developed by using multiple linear regressions (mlr) and artificial neural network (ann) methods. the root m...

Abazar Solgi, Feridon Radmanesh Heidar Zarei Vahid Nourani

Awareness of the level of river flow and its fluctuations at different times is one of the significant factor to achieve sustainable development for water resource issues. Therefore, the present study two hybrid models, Wavelet- Adaptive Neural Fuzzy Interference System (WANFIS) and Wavelet- Artificial Neural Network (WANN) are used for flow prediction of Gamasyab River (Nahavand, Hamedan, Iran...

Journal: :emergency journal 0
hamed aminiahidashti farzad bozorgi seyyed hosein montazer majid baboli abolfazl firouzian

introduction: using physiologic scoring systems for identifying high-risk patients for mortality has been considered recently. this study was designed to evaluate the values of acute physiology and chronic health evaluation ii (apache ii) and simplified acute physiologic score (saps ii) models in prediction of 1-month mortality of critically ill patients. methods: the present prospective cross ...

Journal: :پژوهش آب در کشاورزی 0
جواد بهمنش دانشیار گروه مهندسی آب، دانشکده کشاورزی، دانشگاه ارومیه. نسرین آزاد طلاتپه دانشجوی کارشناسی ارشد گروه مهندسی آب، دانشکده کشاورزی، دانشگاه ارومیه. مجید منتصری دانشیار گروه مهندسی آب، دانشکده کشاورزی، دانشگاه ارومیه سینا بشارت استادیار گروه مهندسی آب، دانشکده کشاورزی، دانشگاه ارومیه.

comparison of linear and nonlinear (bilinear) time series models in reference crop evapotranspiration prediction in urmia synoptic stationreference crop evapotranspiration (eto) prediction is one of the important elements in optimizing agricultural water consumption. in this regard, one of the prediction approaches is to use the stochastic time series methods. in this research, ar (p) and arma(...

Journal: :gastroenterology and hepatology from bed to bench 0
ahmad reza baghestani department of biostatistics, faculty of paramedical sciences, shahid beheshti university of medical sciences, tehran, iran mahmood reza gohari department of biostatistics, iran university of medical sciences, tehran, iran arezoo orooji department of biostatistics, faculty of paramedical sciences, shahid beheshti university of medical sciences, tehran, iran mohamad amin pourhoseingholi gastroenterology and liver diseases research center, shahid beheshti university of medical sciences, tehran, iran

background and objectives: survival models are statistical technique to estimate or predict the overall time up to specific events. prediction is important in medical science and the accuracy of prediction is determined by a measurement, generally based on loss functions, called prediction error. the aim of this study is using parametric models to determine the factors influencing predicted sur...

Considering the fact that Iran is situated in an arid and semi-arid region, rainfall prediction for the management of water resources is very important and necessary. Researchers have proposed various prediction methods that have been utilized in such areas as water and meteorology, especially water resources management. The present study aimed at predicting rainfall amounts using Grey Predicti...

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