Sharp non-parametric bounds on the winner’s curse effects (the difference between the mean value and the mean value conditional on winning) are derived for sealed-bid auctions with affiliated values. Both firstand second-price formats are considered. In addition, sharp bounds are derived on the competitive effect, the difference between the mean value conditional on winning and the mean bid. Al...

The identification of human basic actions plays an important role for recognizing human activities in complex scene. In this paper we propose an approach for automatic human action recognition. The parametric model of human is extracted from image sequences using motion/texture based human detection and tracking. Action features from its model are carefully defined into the action interaction r...

Purpose: Recent studies showed that African Americans (AA) breast cancer patients experience lower survival than any other race. The knowledge of cause-specific survival of such patients is necessary to investigate the different factors associated with the disease and support the clinical practice. Methods: The parametric competing risk method is applied to build up the survival models and the ...

BACKGROUND Estimates of life expectancy are a key input to cost-effectiveness analysis (CEA) models for cancer treatments. Due to the limited follow-up in Randomized Controlled Trials (RCTs), parametric models are frequently used to extrapolate survival outcomes beyond the RCT period. However, different parametric models that fit the RCT data equally well may generate highly divergent predictio...

Previous work examined the suitability of relying on routine methods model selection when extrapolating survival data in a health technology appraisal setting. Here we explore solutions to improve reliability restricted mean time (RMST) estimates from trial by assessing plausibility and implementing averaging. We compare our previous selecting for extrapolation using Akaike information criterio...

liquid-phases adsorption equilibrium of phenol onto two naturally available soils namely kalathur soil (kr) and adhanur soil (ar) were studied. the experimental data were analyzed using fourteen isotherm models, ranging from single-parametric model to multi-parametric models (up to 5 parameters) of the system. results show that in general the accuracy of models to fit experimental data improves...

BACKGROUND Identification of the prognostic factors for survival in patients with liver transplantation is challengeable. Various methods of survival analysis have provided different, sometimes contradictory, results from the same data. OBJECTIVE To compare Cox's regression model with parametric models for determining the independent factors for predicting adults' and pediatrics' survival aft...