Approximation of some discrete-time stochastic processes by differential equations

Approximation of some discrete-time stochastic processes by differential equations

Thisworkdealswithsolutionsofordinarydifferentialequationsasapproximationsofsomediscrete-timestochasticprocesses.Similarly,thesestochasticprocessesmaybeseenasschemesofapproximationforthissolution.Indeed,thesestochasticschemesaredefinedandtheirconvergencetothesolutionofadifferentialequationisproven.More-over,theasymptoticdistributionofthefluctuationsaboutthelimitsolutionisstudied.Thisfactgivestheasymptoticdistributionofarandomglobalerrorofapproximation.MainresultsareillustratedbymeansofthesocalledSISepidemicmodelandnumericalsimulationsarecarriedout.

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