Description Usage Arguments Details Value Author(s) Examples

A function that returns the probability a randomly chosen animal will not be detected during the survey, given the survey design. Model parameters are provided in a vector. Survey information must be stored in specific-named global variables (see Details).

1 | ```
PrNotDetect(params)
``` |

`params` |
A vector containing six parameter values (see Details). |

The input `params`

contains the following values:

[tbar] The day when recruitment peaks.

[sigma] The spread in recruitment (days). Approximately 95% of recruitments occur during days [tbar - 2*sigma, tbar + 2*sigma].

[alpha0] Baseline catch rate (per unit effort).

[alpha1] Age-dependence in catch rate.

[beta0] Base-line mortality rate (per day).

[beta1] Age-dependence in mortality rate.

Recruitment is described by a Guassian peak centred on day `tbar`

with spread characterised by `sigma`

. Per-capita catch rate is given by: `alpha0*exp(alpha1*age)`

, where `age`

is the days since recruitment. Per-capita mortality rate is given by: `beta0*exp(beta1*age)`

.

Suppose the survey involves the capture of animals over `J`

sampling events. The data must be stored and summarised by the following R-variables:

- E
A double vector of size

`J`

quantifying the effort applied during each sampling event.- T
An integer vector of size

`J`

providing the day of each sampling event.- T.F
An integer indicating the first possible day of recruitment.

- T.L
An integer (>

`T.F`

) indicating the last possible day of recruitment.

A single value.

Shane A. Richards ([email protected])

1 2 | ```
guess <- c(3.0, 3.0, 0.2, 0.0, 0.03, 0.1)
PrNotDetect(guess)
``` |

shanearichards/crrecruit documentation built on May 29, 2019, 8:07 p.m.

Embedding an R snippet on your website

Add the following code to your website.

For more information on customizing the embed code, read Embedding Snippets.