`ricker`

is a `pomp`

object encoding a stochastic Ricker model with Poisson measurement error.

The state process is *N[t+1] = r N[t] exp(-N[t]+e[t])*, where the *e[t]* are i.i.d. normal random deviates with zero mean and variance *sigma^2*.
The observed variables *y[t]* are distributed as *Poisson(phi N[t])*.

`pomp`

, `gompertz`

, and the tutorials on the package website.

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