نتایج جستجو برای: additive hazards model

تعداد نتایج: 2184046  

Journal: :تولیدات دامی 0
سامان عباسی کارشناس ارشد، گروه علوم دامی، دانشکدۀ کشاورزی، دانشگاه آزاد اسلامی واحد کرج، کرج، ایران مختار علی عباسی دانشیار، بخش پژوهش‏های ژنتیک و اصلاح نژاد، مؤسسۀ تحقیقات علوم دامی کشور، کرج، ایران علیرضا نوشری استادیار، گروه علوم دامی، دانشکدۀ کشاورزی، دانشگاه آزاد اسلامی واحد کرج، کرج، ایران

a total of 2000 records of egg quality of 746 birds and body weight data from 17th generation of fars native fowl breeding station were used to estimate the genetic parameters of egg quality and body weight traits. six univariate animal models with different random effects were fitted for each trait. a model with direct additive genetic and maternal permanent environmental effects was the most ...

ژورنال: امداد و نجات 2018
Sharafi, Siyamack , abbasi, hamed, maryanaji, zohreh,

BACKGROUND: Rural areas, usually when compared to other natural events, have the greatest vulnerability of human settlements. The aim of this study was to evaluate natural hazards as earthquakes, landslides, floods and identify high-risk zone in relation to the rural areas of the central township of Azna County, Iran. METHODS: Topographic and geology maps, elevation digital model, and seismic ...

Journal: :Biometrics 1999
P S Yip Y Zhou D Y Lin X Z Fang

We use the semiparametric additive hazards model to formulate the effects of individual covariates on the capture rates in the continuous-time capture-recapture experiment, and then construct a Horvitz-Thompson-type estimator for the unknown population size. The resulting estimator is consistent and asymptotically normal with an easily estimated variance. Simulation studies show that the asympt...

2006
Ileana Baldi Giovannino Ciccone Antonio Ponti Stefano Rosso Roberto Zanetti Dario Gregori

Semiparametric hazard function regression models are among the well studied risk models in survival analysis. The Cox proportional hazards model has been a popular choice in modelling data from epidemiological settings. The Cox-Aalen model is one of the tools for handling the problem of non-proportional effects in the Cox model. We show an application on Piedmont cancer registry data. We initia...

1994
Ian W. McKeague Mei-Jie Zhang

Cox's proportional hazards model is often t to grouped survival data, i.e. occurrence/exposure data over given time intervals and covariate strata. We derive a Sheppard correction for the bias in the grouped data analogue of Cox's maximum partial likelihood estimator. This is done via a large sample theory in which the covariate strata and time intervals shrink as the sample size increases.

2015
Christos Argyropoulos Mark L. Unruh

BACKGROUND Randomized Controlled Trials almost invariably utilize the hazard ratio calculated with a Cox proportional hazard model as a treatment efficacy measure. Despite the widespread adoption of HRs, these provide a limited understanding of the treatment effect and may even provide a biased estimate when the assumption of proportional hazards in the Cox model is not verified by the trial da...

ژورنال: Hormozgan Medical Journal 2012
Hosseini Teshnizi, S, Tazhibi, M, Zare, SH,

Introduction: The most important models used in analysis of survival data is proportional hazards models. Applying this model requires establishment of the relevance proportional hazards assumption, otherwise it world lead to incorrect inference. This study aims to evaluate Cox and Weibull models which are used in identification of effective factors on survival time in acute leukemia. Me...

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