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arXiv 2010.03097physics.soc-phq-bio.PE
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流行病学的时变SI模型及其在Covid-19中的应用

Time-dependent SI model for epidemiology and applications to Covid-19

L. Arturo Urena-Lopez, Alma X. Gonzalez-Morales

摘要:

一个概括的易感传染性模型,包括一个随时间变化的传输率,这导致一个密切的分析表达式的逻辑函数。该解决方案可以应用于任何连续的功能选择来描述随时间的传输速率的演变。从Covid-19的真实数据中获得灵感,对于累计确认的阳性和死亡的情况,我们提出了一个指数衰减的传输率,其中有两个自由参数,一个是其初始幅度,另一个是其衰减率。由此产生的时间依赖SI模型,在额外的条件下恢复标准Gompertz函数的形式,然后与来自选定的国家和它的参数拟合使用贝叶斯推断的数据进行比较。我们对确认的阳性和死亡的渐近数量进行预测,并根据我们对传播率的参数化讨论了每个国家疾病的可能演变。

英文摘要:

A generalisation of the Susceptible-Infectious model is made to include a time-dependent transmission rate, which leads to a close analytical expression in terms of a logistic function. The solution can be applied to any continuous function chosen to describe the evolution of the transmission rate with time. Taking inspiration from real data of the Covid-19, for the case of cumulative confirmed positives and deaths, we propose an exponentially decaying transmission rate with two free parameters, one for its initial amplitude and another one for its decaying rate. The resultant time-dependent SI model, which under extra conditions recovers the standard Gompertz functional form, is then compared with data from selected countries and its parameters fit using Bayesian inference. We make predictions about the asymptotic number of confirmed positives and deaths, and discuss the possible evolution of the disease in each country in terms of our parametrisation of the transmission rate.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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