salmon.rate: Simulated Data on Rate of Recruitment for Salmon

In jverzani/UsingR: Data Sets, Etc. for the Text "Using R for Introductory Statistics", Second Edition

Description

The Ricker model is used to model the relationship of recruitment of a salmon species versus the number of spawners. The model has two parameters, a rate of growth at small numbers and a decay rate at large numbers. This data set is simulated data for 83 different recordings using parameters found in a paper by Chen and Holtby.

Usage

data(salmon.rate)

Format

The format is: 83 numbers on decay rates.

Details

The Ricker model for recruitment modeled by spawner count

S exp(a-bS)

The paramter b is a decay rate for large values of S. In the paper by Chen and Holtby, they studied 83 datasets and found that b is log-normally distributed. The data is simulated from their values to illustrate a log normal distribution.

Source

These values are from D.G. Chen and L. Blair Holtby, “A regional meta-model for stock recruitment analysis using an empirical Bayesian approach”, found at http://www.iphc.washington.edu/.

Examples

data(salmon.rate)
hist(log(salmon.rate))

jverzani/UsingR documentation built on Aug. 3, 2020, 11:57 a.m.