The Ricker XXXXXXXXXXmodel is a classical population model that gives the expected number of individuals Nt in generation t ∈ N as a function of the number of individuals in the previous generation....

The Ricker (1954) model is a classical population model that gives the expected number of individuals Nt in generation t ∈ N as a function of the number of individuals in the previous generation. This model is described by a difference

The data salmon in nltsa are the annual number of salmon (any species) counted over the John Day Dam for 30 years, beginning in 1968.

(a) Examine the data, and with justification, decide if a Ricker model is appropriate.

(b) Use one or two of the methods discussed in this chapter to fit the model. State your conclusions.