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).
A vector containing six parameter values (see Details).
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:
age is the days since recruitment. Per-capita mortality rate is given by:
Suppose the survey involves the capture of animals over
J sampling events. The data must be stored and summarised by the following R-variables:
A double vector of size
J quantifying the effort applied during each sampling event.
An integer vector of size
J providing the day of each sampling event.
An integer indicating the first possible day of recruitment.
An integer (>
T.F) indicating the last possible day of recruitment.
A single value.
Shane A. Richards ([email protected])
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