Cox proportional hazards model is a commonly used model in providing hazard ratio to compare survival times of two population groups. The exponentiated linear regression part of the model describes the effects of explanatory variables on hazard ratio. PROC PHREG is a SAS procedure that implements the Cox model and provides the hazard ratio estimate. The estimate is interpreted as the percent ch...

The problem that arises in the Cox model is there are more than two types of covariates and presence random effects a non-proportional hazard (NPH). One example case involves many factors student retention. Low retention can lead to dropping out college or failure completing studies. purpose this study overcome NPH caused by presenceof time-independent covariates, time-dependent effects. resear...

Residential location choice modeling is one of the areas in transportation planning that attempts to examine households location search behavior incorporating their trade-offs between housing quality, prices or rents, distance to work and other key factors. This brings up the need to come up with methods to logically allocate credible choice alternatives for individuals.This article attempts to...

The software reliability model is the stochastic to measure quantitatively. A Hazard-Rate Model well-known one as typical model. We propose Models Considering Fault Severity Levels (CFSL) for Open Source Software (OSS). purpose of this research make considering CFSL adapt baseline hazard function and 2 kinds faults data in Bug Tracking System (BTS), i.e., we use covariate vectors Cox proportion...