Variable selection problem for the nonlinear Cox regression model is considered. In survival analysis, one main objective to identify covariates that are associated with risk of experiencing event interest. The proportional hazard being used extensively in analysis studying relationship between times and covariates, where assumes covariate has a log-linear effect on function. However, this line...

aim : to determine the associated factors of reflux duration, using quantile regression model. background : reflux is one of the most prevalent gastrointestinal disorders.  statistical tools are widely used to assess the associated factors on reflux severity and frequency. patients and methods : a door to door questionnaire has been used to evaluate gastrointestinal symptoms including reflux an...

As customers are the main asset of any organization, customer churn management is becoming a major task for organizations to retain their valuable customers. In the previous studies, the applicability and efficiency of hierarchical data mining techniques for churn prediction by combining two or more techniques have been proved to provide better performances than many single techniques over a nu...

The four-card selection task (Wason, 1966) has been one of the most well-known tasks used in the literature on human reasoning. This article aimed to analyze this selection task by item response theory (Lord & Novick, 1968). Japanese undergraduates (N = 327 and 277 in Studies 1 and 2, respectively) responded to up to 10 types of representative Wason selection tasks, including the indicative tas...

conclusions the present study detected more accurate results for ann method compared to those of cox ph model to analyze the survival of patients with liver transplantation. furthermore, the order of effective factors in patients’ survival after transplantation was clinically more acceptable. the large dataset with a few missing data was the advantage of this study, the fact which makes the res...