salmon.rate {UsingR} | R Documentation

## Simulated Data on Rate of Recruitment for Salmon

### 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))

[Package UsingR version 0.1-4 Index]