Effects such as student dropout and the non-normal distribution of duration data confound the exploration of tutor efficiency, time-intutor vs. tutor performance, in intelligent tutors. We use an accelerated failure time (AFT) model to analyze the effects of using automatically generated hints in Deep Thought, a propositional logic tutor. AFT is a branch of survival analysis, a statistical tech...

Current status data arise commonly in applications when there is only one feasible observation time to check if the failure has occurred, but exact remains unknown. To accommodate covariate effect on time, accelerated (AFT) model been widely used analyze current with distribution of assumed be specified or unspecified. In this paper, we consider a logistic regression misclassfied from scheme. A...

Instrumental Variable Estimation of Treatment Effects for Duration Outcomes In this article we propose and implement an instrumental variable estimation procedure to obtain treatment effects on duration outcomes. The method can handle the typical complications that arise with duration data of time-varying treatment and censoring. The treatment effect we define is in terms of shifting the quanti...

The accelerated failure time (AFT) model is an important regression tool to study the association between survival time and covariates. Semiparametric inference procedures have been proposed extensively in the literature. Recently, Zhou (2005a) proposed to use a model-based empirical likelihood approach to interval estimation for the AFT model. However, comparison was not made with more standar...

In this paper, a new servicing strategy with imperfect repair is defined and studied for the manufacturer of a product sold with a two-dimensional warranty. The strategy is based on a specified region of the warranty defined in terms of age and usage, with the first failure in the region rectified by an imperfect repair and all other failures being minimally repaired. Product failures are model...

The generalized Topp-Leone-Weibull (GTL-W) distribution is a generalization of Weibull which obtained by using Topp-Leone (GTL) as generator and considering baseline distribution. widely used survival model that has monotone- increasing or decreasing hazard. But it cannot accommodate bathtub shaped unimodal hazards. As model, GTL-W more flexible than the to different types present study aims at...

OBJECTIVE Survival time is an important type of outcome variable in treatment research. Currently, limited guidance is available regarding performing mediation analyses with survival outcomes, which generally do not have normally distributed errors, and contain unobserved (censored) events. We present considerations for choosing an approach, using a comparison of semi-parametric proportional ha...

In 2022, the COVID-19 virus is still making headlines in various mass media because it a that very dangerous to health. The world health organization, WHO, explained caused global pandemic infected whole world. condition of has not yet turned into an endemic. Based on total confirmed positive cases, Indonesia ranks 18th out 222 countries. To determine influence factors survival analysis one tec...

Bridge deck deterioration modeling is critical to infrastructure management. Deterioration traditionally done using deterministic models, stochastic and recently basic machine learning methods. The advanced learning-based survival such as random forest, have not been adapted for use in This paper introduces forest models bridge compare their performance with a commonly used traditional model, t...