نتایج جستجو برای: birth death process

تعداد نتایج: 1658808  

Journal: :American Journal of Public Health 1926

Journal: :Journal of Statistical Physics 2016

Journal: :Statistics & Probability Letters 2005

Journal: :Applied Mathematics and Computation 2023

Due to limited cognitive skills for perceptual error or other emotional reasons, players may keep their current strategies even if there is a more promising choice. Such behavior inertia has already been studied, but its consequences remained unexplored in the weak selection limit. To fill this gap, we consider spatial public goods game model where considered during imitation process. By using ...

2017
Timothy G. Vaughan Gabriel E. Leventhal David A. Rasmussen Alexei J. Drummond David Welch Tanja Stadler

Modern phylodynamic methods interpret an inferred phylogenetic tree as a partial transmission chain providing information about the dynamic process of transmission and removal (where removal may be due to recovery, death or behaviour change). Birth-death and coalescent processes have been introduced to model the stochastic dynamics of epidemic spread under common epidemiological models such as ...

2005
Nicolas Champagnat R'egis Ferriere Sylvie M'el'eard

We are interested in modelling Darwinian evolution, resulting from the interplay of phenotypic variation and natural selection through ecological interactions. Our models are rooted in the microscopic, stochastic description of a population of discrete individuals characterized by one or several adaptive traits. The population is modelled as a stochastic point process whose generator captures t...

Journal: :Methodology and Computing in Applied Probability 2021

Abstract This paper considers a continuous-time quasi birth-death ( qbd ) process, which informally can be seen as process of the parameters are modulated by an external Markov chain. The aim is to numerically approximate time-dependent distribution resulting bivariate in accurate and efficient way. An approach based on Erlangization principle proposed formally justified. Its performance invest...

Journal: :acta medica iranica 0
fatemeh nayeri neonatologist, maternal-fetal-neonatal research center ,tehran university of medical sciences, tehran, iran. hosein dalili neonatologist, breastfeeding research center ,tehran university of medical sciences, tehran, iran. firoozeh nili neonatologist, maternal-fetal-neonatal research center ,tehran university of medical sciences, tehran, iran. elaheh amini neonatologist, breastfeeding research center ,tehran university of medical sciences, tehran, iran. ali ardehali general physician, school of medicine, tehran university of medical sciences, tehran, iran. babak khoshkrood mansoori general physician, school of medicine, tehran university of medical sciences, tehran, iran.

the objective of this study is to determine risk factors causing increase in very low birth way (vlbw) neonatal mortality. the medical files of all neonates weighing ≤1500 g, born in vali-e-asr hospital (2001-2004) were studied. two groups of neonates (living and dead) were compared up to the time of hospital discharge or death. a total of 317 neonates were enrolled. a meaningful relationship e...

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