نتایج جستجو برای: stratified cox regression model

تعداد نتایج: 2377578  

Abbas Bahrampour, Abolfazl Hosseinnataj Farzaneh Zolala, Fereshteh Mazidi Sharaf Abadi Mehdi Torabi, Mohammadreza Baneshi, Roya Nikbakht,

Background: Two main issues that challenge model building are number of Events Per Variable and multicollinearity among exploratory variables. Our aim is to review statistical methods that tackle these issues with emphasize on penalized Lasso regression model.  The present study aimed to explain problems of traditional regressions due to small sample size and m...

Journal: :journal of paramedical sciences 0
ahmad reza baghestani school of paramedical sciences, shahid beheshti university of medical sciences, tehran, iran abolfazl payandeh mojtaba soltani kermanshahi zahra taher asadi health network of eslamshahr, tehran university of medical sciences, tehran, iran

the waiting time between children births are called tempo. this phenomenon plays a crucial role in the child and mother health. the purpose of the present study is determination of factors which influence this variable of interest. a significance level of 5% and power of 80% considered to calculate the required sample size for this cross sectional study. the sample size of 124 women determined ...

Journal: :journal of family and reproductive health 0
mojtaba kermanshahi division of biostatistics, statistics unit, network health of eslamshahr, tehran university of med najaf zare department of biostatistics, medical faculty, shiraz university of medical sciences sepideh samimi division of midwife, extension unit, network health of eslamshahr, tehran university of medical sc

objective: tempo is the average waiting time to next birth for a woman. role of fertility as the most important phenomenon determining population fluctuations due to the studies of it compared with other demographic phenomena be important and review the multifarious socioeconomic factors of it share  a large effective population studies. general purpose of this study is fitting the cox model to...

ژورنال: طلوع بهداشت یزد 2013
عطاری, قوام الدین, علی آبادی, محسن, فرهادیان, مریم, محجوب, حسین ,

  Background: The occupational exposure conditions such as dust concentration, exposure time, smoking status and use of respiratory protection device are effective on pulmonary function disorder. The aim of this study was to determine the risk of pulmonary function disorder in the workers exposed to silica dust in the stone crushing by using Cox regression model.   Method: 117 of workers employ...

Journal: :Statistics in medicine 2007
Yuh-Ing Chen Yu-Mei Chang

In this paper, we are concerned with the estimation of the discrepancy between two treatments when right-censored survival data are accompanied with covariates. Conditional confidence intervals given the available covariates are constructed for the difference between or ratio of two median survival times under the unstratified and stratified Cox proportional hazards models, respectively. The pr...

Journal: :gastroenterology and hepatology from bed to bench 0
mohamad amin pourhoseingholi soghrat faghihzadeh manijeh habibi azadeh safaee fatemeh qafarnejad mohammad rostami nejad

aim : to determine the associated factors of reflux duration, using quantile regression model. background : reflux is one of the most prevalent gastrointestinal disorders.  statistical tools are widely used to assess the associated factors on reflux severity and frequency. patients and methods : a door to door questionnaire has been used to evaluate gastrointestinal symptoms including reflux an...

Abdolrasoul Bardideh Amir Hossein Hashemian Behrouz Beiranvand, Eghbal Zand-Karimi Mansour Rezaei

Cox regression model serves as a statistical method for analyzing the survival data, which requires some options such as hazard proportionality. In recent decades, artificial neural network model has been increasingly applied to predict survival data. This research was conducted to compare Cox regression and artificial neural network models in prediction of kidney transplant survival. The prese...

اشرفی, فرزانه, اشرفی, مهدی, حمیدی بهشتی, محمد تقی, شهیدی, شهرزاد,

Background: Kidney transplantation had been evaluated in some researches in Iran mainly with clinical approach. In this research we evaluated graft survival in kidney recipients and factors impacting on survival rate. Artificial neural networks have a good ability in modeling complex relationships, so we used this ability to demonstrate a model for prediction of 5yr graft survival after ki...

Journal: :international journal of occupational hygiene 0
fatemeh khaldari msc student, department of biostatistics and epidemiology, faculty of health, kerman university of medical sciences, kerman, iran; narges khanjani associate professor, environmental health engineering research center, kerman university of medical sciences, kerman, iran abbas bahrampour professor, department of biostatistics and epidemiology, faculty of health, kerman university of medical sciences, kerman, iran mohammad reza ghotbi ravandi assistant professor, department of occupational health, faculty of health, kerman university of medical sciences, kerman, iran ali ali asghar arabi mianroodi assistant professor, department of ear, nose and throat, faculty of medicine, kerman university of medical sciences, kerman, iran

original article   extended exposure to noise can cause permanent hearing damage. this study aimed to determine the incidence time of hearing loss and its effective factors in workers exposed to noise. this retrospective cohort study, was conducted on a total of 273 workers in various sectors of kerman copper by-industries co. their hearing status and the incidence of hearing loss (hearing thre...

Journal: :IEEE Transactions on Information Theory 2021

Point processes in time have a wide range of applications that include the claims arrival process insurance or analysis queues operations research. Due to advances technology, such samples point are increasingly encountered. A key object interest is local intensity function. It has straightforward interpretation allows understand and explore data. We consider functional approaches for processes...

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