نتایج جستجو برای: survival model

تعداد نتایج: 2389577  

Journal: :iranian journal of public health 0
maryam farhadian 1. dept. of epidemiology & biostatistics, school of public health, hamadan university of medical sciences , hamadan. iran . hossein mahjub 2. research center for health sciences and dept. of epidemiology & biostatistics, school of public health, hamadan university of medical sciences , hamadan, iran. abbas moghimbeigi 3. modeling of noncommunicable diseases research center and dept. of epidemiology & biostatistics, school of public health, hamadan university of medical sciences , hamadan, iran. jalal poorolajal 3. modeling of noncommunicable diseases research center and dept. of epidemiology & biostatistics, school of public health, hamadan university of medical sciences , hamadan, iran. muharram mansoorizadeh 4. dept. of computer engineering, faculty of engineering, bu-ali sina university , hamadan, iran.

an important aspect of microarray studies includes the prediction of patient survival based on their gene expression profile. to deal with the high dimensionality of this data, use of a dimension reduction procedure along with the survival prediction model is necessary. this study aimed to present a new method based on wavelet transform for survival relevant gene selection.the data included 204...

Journal: :journal of research in health sciences 0
ali asghar akhlaghi iraj najafi mahmood mahmoodi abbas shojaee mahmoud yousefifard mostafa hosseini

background: peritoneal dialysis is one of the most prevalent types of dialysis prescribed to the patients suffering from renal failure. studies on the factors affecting the survival of these patients have mainly used log-rank test and cox analysis. the present study aimed to investigate the risk factors affecting short- and long term survival of patients on continuous ambulatory peritoneal dial...

ژورنال: اندیشه آماری 2021

In conventional methods for spatial survival data modeling, it is often assumed that the coefficients of explanatory variables in different regions have a constant effect on survival time. Usually, the spatial correlation of data through a random effect is also included in the model. But in many practical issues, the factors affecting survival time do not have the same effects in different regi...

Application of data mining methods as a decision support system has a great benefit to predict survival of new patients. It also has a great potential for health researchers to investigate the relationship between risk factors and cancer survival. But due to the imbalanced nature of datasets associated with breast cancer survival, the accuracy of survival prognosis models is a challenging issue...

Abolghasemi, Jamile, Hasannezhad , Malihe, Kargarian-Marvasti , Sadegh,

Background and Objectives: This study aimed to investigate the effective factors in the survival/hazard time of Covid-19 patients in three waves of epidemic.   Methods: All 880 Covid-19 patients were included in this prospective cohort study using the census method. Polymerase chain reaction was used to diagnose Covid-19. The survival status of these patients was followed up for 4 months. The...

Bahrampour , Abbas , Khalilian, Alireza , Nikaeen, Roja ,

Background and Purpose: Gastric cancer is the third leading cause of mortality in Iran after cardiovascular diseases and accidents. The aim of the present study was to assess survival and it’s affecting factors in gastric cancer patients through using Cox and parametric models along with frailty. Materials and Methods: In this study, the medical records of gastric cancer patients treat...

ژورنال: اندیشه آماری 2019
eskandari, fatemeh, faridrohani, mohmmadreza, khalili, davood, momenan, amirabbas, rastin, azam,

 ‎Cardiovascular diseases (CVDs) are the leading cause of death worldwide‎. ‎To specify an appropriate model to determine the risk of CVD and predict survival rate‎, ‎users are required to specify a functional form which relates the outcome variables to the input ones‎. ‎In this paper‎, ‎we proposed a dimension reduction method using a general model‎, ‎which includes many widely used survival m...

Journal: :iranian red crescent medical journal 0
abbas rahimi foroushani department of epidemiology and biostatistics, school of public health, tehran university of medical sciences, tehran, ir iran mahmoud salesi nephrology and urology research center, baqiyatallah university of medical sciences, tehran, ir iran zohreh rostami nephrology and urology research center, baqiyatallah university of medical sciences, tehran, ir iran ali reza mehrazmay behaviolar sciences research center, baqiyatallah university of medical sciences, tehran, ir iran jamile mohammadi department of psychology, faculty of humanities, tarbiat modares university, tehran, ir iran behzad einollahi nephrology and urology research center, baqiyatallah university of medical sciences, tehran, ir iran

conclusions by controlling the modifiable risk factors and modality of treatment in our study, physicians can reach more effective treatment. results at the end of the study, long-term graft failure was seen in 27 (10.2%) cases. one-year and 2-year graft survival after diagnosis of cancer were 93.6% and 91.7%, respectively. the univariate analysis showed that the incidence of chronic graft loss...

Journal: :trauma monthly 0
batoul khoundabi department of biostatistics, faculty of medical sciences, tarbiat modares university, tehran, ir iran anoshirvan kazemnejad department of biostatistics, faculty of medical sciences, tarbiat modares university, tehran, ir iran; department of biostatistics, faculty of medical sciences, tarbiat modares university, tehran, ir iran. tel: +98-2182883875, fax: +98-2188006544 marjan mansourian department of epidemiology and biostatistics, school of public health , isfahan university of medical sciences, isfahan, ir iran seyed mohammadreza hashemian critical care, chronic respiratory disease research center (crdrc), national research institute of tuberculosis and lung diseases (nritld), masih daneshvari hospital, shahid beheshti university of medical sciences, tehran, ir iran mehdi kazempoor dizaji department of biostatistics, faculty of medical sciences, tarbiat modares university, tehran, ir iran

conclusions where there is a relationship between two longitudinal and survival responses, joint modeling can estimate it. background admission to the icu (intensive care unit) is frequently complicated by early aki (acute kidney injury). the development of aki following cardiac surgery is particularly associated with increased mortality and morbidity. according to akin (acute kidney injury net...

ژورنال: اندیشه آماری 2016

‎By existing censor and skewness in survival data‎, ‎some models such as weibull are used to analyzing survival data‎. ‎In addition, parametric and semiparametric models can be obtained from baseline hazard function of Cox model to fit to survival data‎. ‎However these models are popular because of their simple usage but do not consider unknown risk factors‎, ‎that's why cannot introduce the be...

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