alk.cpp File Reference

Age-length probability transition matrix. More...

#include "statsLib.h"

Go to the source code of this file.

Functions
dvar_matrix	ageLengthKey (const dvar_vector &mu, const dvar_vector &sig, const dvector &x)
	Age Length Key.
dmatrix	ageLengthKey (const dvector &mu, const dvector &sig, const dvector &x)
	Age Length Key.
dvar_matrix	ALK (dvar_vector mu, dvar_vector sig, dvector x)

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Detailed Description

Age-length probability transition matrix.

Remarks:

This file contains a function for computing a conditional probability transition from age-to-length. This is also known as an age-length-key in standard Fisheries Stock assessment jargon. This function is useful for converting proportions-at-age to length-at-age by mulitplying a vector of age proportions times the age-length-key. The result is a vector of lengths. Note that in this function the rows are ages, and colums are length intervals.

Author:

Steven Martell

Date:

2/27/2011

The function is implemented as

where is the probabilty of being in the length interval for a given age .

Definition in file alk.cpp.

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Function Documentation

dmatrix ageLengthKey	(	const dvector &	mu,
		const dvector &	sig,
		const dvector &	x
	)

Age Length Key.

Author:

Steven James Dean Martell UBC Fisheries Centre

Date:

2011-06-28

Parameters:

mu	is the mean length-at-age
sig	is the std in mean length-at-age
x	is the vector of break points for the length bins

Returns:

dmatrix containing the probability of length(x) for a given age(a)

See also:

Definition at line 79 of file alk.cpp.

dvar_matrix ALK	(	dvar_vector	mu,
		dvar_vector	sig,
		dvector	x
	)

Definition at line 105 of file alk.cpp.