Abstract
Chapter 9 discussed how a linear approximation to the perennially nonlinear dynamics of infectious disease can provide important insights on invasion, stability, and resonant periodicity. As remarked by Nisbet and Gurney (1982) more generally, linear approximation can often provide remarkably useful insights for nonlinear ecological systems as long as they are not too nonlinear.
This chapter uses the following R-packages: deSolve, pomp, and nlts.
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Notes
- 1.
Interestingly Ruelle (1993) paraphrases Henri Poincaré as defining chance as sensitive dependence on unknown initial conditions as far back as 1908.
- 2.
Modeling chicken pox, a herpes virus that can reactivate in older individuals in the form of zoster, Ferguson et al. (1996) showed that the SEIR model cannot sustain multiannual (or chaotic) childhood dynamics in the presence of “immigration” of the virus from an adult carrier group.
- 3.
The method was originally proposed as a nonparametric method to estimate the “order” of a time series (Cheng and Tong 1992).
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Appendix: Making a Pomp-Simulator
Appendix: Making a Pomp-Simulator
Doing the computations involved in Sects. 10.5 and 10.7 are computationally expensive. The pomp-package includes a Csnippet-function that will compile C code on the fly to speed up calculations. The following provides the C code used in the simulations of the stochastic SEIR model.
We first define the Csnippet for the deterministic skeleton of the unobserved process:
Then the Csnippet for the stochastic simulator
pomp wants Csnippets for the observational process also (even if we only use the object for simulation).
We need initial conditions
Finally we can build the pomp object. The dat-data object defines the times for the stochastic simulation. We are not working with data, so the reports column is just a dummy.
The pomp-package has numerous functions to simulate deterministic and stochastic trajectories from pomp-objects.
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Bjørnstad, O.N. (2018). Exotica. In: Epidemics. Use R!. Springer, Cham. https://doi.org/10.1007/978-3-319-97487-3_10
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