BACKGROUND The purpose of this study was to investigate the rate of simultaneous second primary tumor (SPT) in patients with oral squamous cell carcinoma. The survival of patients with simultaneous SPT was also compared with patients without. METHODS The presence of SPT was documented along with the patients' demographic data, tumor-related features, and survival status. Kaplan-Meier method w...

MOTIVATION There has been an increasing interest in expressing a survival phenotype (e.g. time to cancer recurrence or death) or its distribution in terms of a subset of the expression data of a subset of genes. Due to high dimensionality of gene expression data, however, there is a serious problem of collinearity in fitting a prediction model, e.g. Cox's proportional hazards model. To avoid th...

The classical Cox proportional hazards model is a benchmark approach to analyze continuous survival times in the presence of covariate information. In a number of applications, there is a need to relax one or more of its inherent assumptions, such as linearity of the predictor or the proportional hazards property. Also, one is often interested in jointly estimating the baseline hazard together ...

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...

Proportional hazards regression model assumes that the covariates affect the hazard function through a link function and an index which is a linear function of the covariates. Traditional approaches, such as the Cox proportional hazards model, focus on estimating the unknown index by assuming a known link function between the log-hazard function and covariates. A linear link function is often e...

The study aimed to construct a risk prediction model for coronary artery disease (CAD) based on competing risk model among the elderly in Beijing and develop a user-friendly CAD risk score tool. We used competing risk model to evaluate the risk of developing a first CAD event. On the basis of the risk factors that were included in the competing risk model, we constructed the CAD risk prediction...

recently, reports have shown that gastric cancer has high abundance in iran and is at the second level in men, and fourth in total. this study aimed to determine the 5-year survival of gastric cancer patients and to investigate factors affecting the performance, based on tnm-7 staging system. in this study, we investigated 760 patients with gastric cancer since the beginning of 1993 to the end ...