نتایج جستجو برای: parametric models

تعداد نتایج: 957187  

جان بابایی, قاسم, قربانی قلی‌آباد, سمیه, یزدانی چراتی, جمشید,

Background and purpose: One of the most common methods used to estimate the effects of explanatory variables on survival time, is Cox semi parametric model. However, under certain circumstances, accelerated failure time parametric models are superior to the Cox model. The purpose of this study was to assess the efficiency of parametric and semi-parametric models in survival analysis of patients...

Journal: :Journal of Econometrics 2016

2017
Pramod Viswanath Moitreya Chatterjee Tao Sun

The contrast is exemplified by the following classification task. Let’s assume that we are given data, X , i.e. the observed variable and we want to determine its class label, Y, the unobserved (target) variable. A generative classifier, such as Naive Bayes, makes use of the joint distribution of X and Y, i.e. P(X ,Y) to perform this inference. While a discriminative classifier, such as a Logis...

Nowadays, one of the most important topics in risk management of banks, financial, and credit institutions is credit risk management. In this research, the researchers used survival analytic methods for credit risk modeling in terms of the conditional distribution function of default time. As a practical task, the authors considered the reward credit portfolio of Tose'e Ta'avon Bank of Guilan P...

2015
Hyun Chan Lee

The international standard STEP stands for standard for exchange of product model data. It represents ISO 10303. In the STEP, common shape representation is supported by various part groups. In this paper, four major part groups are investigated. The first part group is part 40's, the integrated generic resources, which provide the fundamental framework for shape representation. The second part...

Journal: :journal of industrial engineering, international 2005
f molavi m.b aryanezhad m shah alizadeh

data envelopment analysis (dea) is a technique used to compare efficiency in various sectors such as hospitals, chain stores, and dealerships. it represents a set of linear programming techniques and uses deter-ministic data (inputs and outputs), in stable conditions. the dea technique cannot be used when there is data with indeterministic nature, or when there is an environment with dynamic co...

Journal: :acta medica iranica 0
ramin ravangard department of health management and economics, school of public health, tehran university of medical sciences, tehran, iran. mohamad arab department of health management and economics, school of public health, tehran university of medical sciences, tehran, iran. arash rashidian department of health management and economics, school of public health, tehran university of medical sciences, tehran, iran. ali akbarisari department of health management and economics, school of public health, tehran university of medical sciences, tehran, iran. ali zare department of epidemiology and biostatistics, school of public health, tehran university of medical sciences, tehran, iran. hojjat zeraati department of epidemiology and biostatistics, school of public health, tehran university of medical sciences, tehran, iran.

survival analysis is a set of methods used for analysis of the data which exist until the occurrence of an event. this study aimed to compare the results of the use of the semi-parametric cox model with parametric models to determine the factors influencing the length of stay of patients in the inpatient units of women hospital in tehran, iran. in this historical cohort study all 3421 charts of...

2014
ANDREW WEY JOHN CONNETT KYLE RUDSER

Section 1 demonstrates the connection between the Brier Score in the absence of censoring versus the inverse probability-of-censoring weighted Brier Score. Section 2 derives the meansquared error decomposition presented in Section 3 of the main paper, and presents illustrations and examples regarding the impact of candidate survival models on performance. In addition, a simple example illustrat...

Journal: :journal of biostatistics and epidemiology 0
mahmood salesi research center for prevention of oral and dental diseases, baqiyatallah university of medical sciences, tehran, iran. abbas rahimi-foroushani department of epidemiology and biostatistics, school of public health, tehran university of medical sciences, tehran, iran. jamile mohammadi department of psychology, school of humanities, tarbiat modares university, tehran, iran. zohreh rostami research center for prevention of oral and dental diseases, baqiyatallah university of medical sciences, tehran, iran. ali reza mehrazmay behavioral sciences research center, baqiyatallah university of medical sciences, tehran, iran. behzad einollahi research center for prevention of oral and dental diseases, baqiyatallah university of medical sciences, tehran, iran.

the aim of this study is to introduce a parametric mixture model to analysis the competing-risks data with two types of failure. in mixture context, i t h type of failure is i th component. the baseline failure time for the first and second types of failure are modeled as proportional hazard models according to weibull and gompertz distributions, respectively. the covariates affect on both the ...

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