نتایج جستجو برای: Cox Proportional Regression Analysis

تعداد نتایج: 3035915  

ژورنال: اندیشه آماری 2021

The proportional hazard Cox regression models play a key role in analyzing censored survival data. We use penalized methods in high dimensional scenarios to achieve more efficient models. This article reviews the penalized Cox regression for some frequently used penalty functions. Analysis of medical data namely ”mgus2” confirms the penalized Cox regression performs better than the cox regressi...

Journal: :iranian journal of cancer prevention 0
ma pourhoseingholi research center for gastroenterology and liver disease, shahid beheshti university of medical sciences, tehran, iran a pourhoseingholi research center for gastroenterology and liver disease, shahid beheshti university of medical sciences, tehran, iran m vahedi research center for gastroenterology and liver disease, shahid beheshti university of medical sciences, tehran, iran b moghimi dehkordi research center for gastroenterology and liver disease, shahid beheshti university of medical sciences, tehran, iran a safaee research center for gastroenterology and liver disease, shahid beheshti university of medical sciences, tehran, iran s ashtari research center for gastroenterology and liver disease, shahid beheshti university of medical sciences, tehran, iran

background: although the cox proportional hazard regression is the most popular model for analyzing the prognostic factors on survival of cancer patients, under certain circumstances, parametric models estimate the parameter more efficiently than the cox model.  the aim of this study was to compare the cox regression model  with parametric models in patients with gastric cancer who registered a...

باغستانی, احمد رضا, حاجی زاده, ابراهیم, نور کجوری, هدی, پورحسینقلی, محمد‌امین ,

Background & Objectives: Cox regression model is one of the statistical methods in survival analysis. The use of smoothing techniques in Cox model makes the more accurate estimates for the parameters. Fractional polynomial is one of these techniques in Cox model. The aim of this study was to assess the effects of prognostic factors on survival of patients with gastric cancer using the fractiona...

Journal: :iranian journal of applied language studies 2012
azar hosseini fatemi saeedeh shamsaee mohammad ali shams

the aim of this study is to investigate iranian tefl graduates’ conception of measurement error in research. adopting a sequential explanatory multi-method strategy (borg, 2009), the researchers analyzed causal and temporal relations in the research narratives elicited from 30 tefl graduates. gee’s (1986) framework for identifying narrative discourse units (lines, stanzas, and episodes) was ado...

Journal: :iranian journal of public health 0
a biglarian e hajizadeh a kazemnejad mr zali

background : the aim of this study was to predict the survival rate of iranian gastric cancer patients using the cox proportional hazard and artificial neural network models as well as comparing the ability of these approaches in predicting the survival of these patients. methods: in this historical cohort study, the data gathered from 436 registered gastric cancer patients who have had surgery...

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: :iranian red crescent medical journal 0
hoda noorkojuri department of biostatistics, faculty of medical sciences,tarbiat modares university, tarbiat modares university, tehran, ir iran ebrahim hajizadeh department of biostatistics, faculty of medical sciences,tarbiat modares university, tarbiat modares university, tehran, ir iran; tarbiat modares university, jalal ale ahmad highway, tehran, ir iran, tel: +98-2182883810, fax: +98-2182884555 ahmadreza baghestani 2. department of biostatistics, faculty of paramedical sciences, shahid beheshti university of medical sciences, tehran, ir iran mohamadamin pourhoseingholi department of biostatistics, gastroenterology and liver diseases research center, shahid beheshti university of medical sciences, tehran, ir iran

conclusions the use of smoothing methods helps us to eliminate non-linear effects but it is more appropriate to use cox proportional hazards model in medical data because of its’ ease of interpretation and capability of modeling both continuous and discrete covariates. also, cox proportional hazards model and smoothing methods analysis identified that age at diagnosis and tumor size were indepe...

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