In many time-to-event studies, particularly in epidemiology, the time of the first observation or study entry is arbitrary in the sense that this is not a time of risk modification. We present a formal argument that, in these situations, it is not advisable to take the first observation as the time origin, either in accelerated failure time or proportional hazards models. Instead, we advocate u...

Th is study evaluated changes in shoulder muscle isometric endurance, deltoideus and trapezius muscle electromyographic activity (EMG) and stiff ness in patients with frozen shoulder syndrome (FSS) before and aft er manipulation under general anaesthesia (MUA). Eighteen FSS patients with mean age of 53±9 years participated. Isometric endurance of shoulder muscles was characterized by endurance ...

Manufacturers need to evaluate the reliability of their products in order to increase the customer satisfaction. Proper analysis of reliability also requires an effective study of the failure process of a product, especially its failure time. So, the Failure Process Modeling (FPM) plays a key role in the reliability analysis of the system that has been less focused on. This paper introduces a f...

Background. Candida species are the fourth leading cause of nosocomial bloodstream infections in the United States, however incidence is low and most patients who receive empiric treatment do not actually have candidemia. Unfortunately, detection, identification and susceptibility testing using standard instrumented blood culture systems and routine microbiological techniques takes 4–10 days. A...

In this paper, we consider an  i.e., multiple step-stress accelerated life testing (ALT) experiment with unequal duration of time . It is assumed that the time to failure of a product follows Rayleigh distribution with a log-linear relationship between stress and lifetime and also we assume a generalized Khamis-Higgins model for the effect of changing stress levels. Taking into account that the...

Background. Candida species are the fourth leading cause of nosocomial bloodstream infections in the United States, however incidence is low and most patients who receive empiric treatment do not actually have candidemia. Unfortunately, detection, identification and susceptibility testing using standard instrumented blood culture systems and routine microbiological techniques takes 4–10 days. A...

A two-stage procedure for simultaneously detecting multiple thresholds and achieving model selection in the segmented accelerate failure time (AFT) model is developed in this paper. In the first stage, we formulate the threshold problem as a group model selection problem so that a concave 2-norm group selection method can be applied. In the second stage, the thresholds are finalized via a refin...

Abstract Object We characterized the patterns of clinical practice in benign meningioma resection and survival outcome as a function patient age using Surveillance, Epidemiology End Results (SEER) SEER-Medicare database. METHODS The likelihood for recommendation to proceed with adult, patients were logistic regression. Survival analysis was performed propensity-score matching (PSM)-method (cova...

Abstract Background Survival analysis is the most appropriate method of for time-to-event data. The classical accelerated failure-time model a more powerful and interpretable than Cox proportional hazards model, provided that imposed distribution homoscedasticity assumptions satisfied. However, real data are heteroscedastic which violates fundamental assumption consequently, statistical inferen...

Classical lacunae in the solutions of hyperbolic differential equations and systems (in the spaces of odd dimension) are a manifestation of the Huygens’ principle. If the source terms are compactly supported in space and time, then, at any finite location in space, the solution becomes identically zero after a finite interval of time. In other words, the propagating waves have sharp aft fronts....