[ADMB Users] Retrospective analysis

[Jim Ianelli]

My approach has been to not change the data file but fake it out.

 

For example, if the full model runs from styr to endyr I read all the data
in that way then have a variable (integer) also read in that sets the number
of years to peel off (zero for full model).

 

After reading in the data, I use a surrogate endyr to dimension all the
other variables.  E.g., endyr_r (_r for retrospective) and ensure that all
predicted values are dimensioned accordingly.

 

Care must be taken however to test for cases where peeling off data exceeds
the number of observations for some data types.  E.g., if you have a survey
time series that starts in 2002 and you peel of 10 years from a model that
ends in 2010.

 

It takes a little extra coding but has paid off.  

 

Be sure to compile in safe mode!

 

Cheers,

Jim

 

 

James Ianelli

 <http://www.afsc.noaa.gov/REFM/stocks/assessments.htm> REFM Division,
Alaska Fisheries Science Center

National Marine Fisheries Service, National Oceanic and Atmospheric
Administration

7600 Sand Point Way NE

Seattle WA 98115

 

Ph. 206 526 6510

 

From: users-bounces at admb-project.org [mailto:users-bounces at admb-project.org]
On Behalf Of Luis Ridao
Sent: Monday, November 01, 2010 9:46 AM
To: users at admb-project.org
Subject: [ADMB Users] Retrospective analysis

 

ADMB-help,

I was wondering how to implement a retrospective analysis of a given
catch-at-age model.
The straightforward but also the slowest approach might be to shorten the
data file and adjust
the parameter section accordingly but I guess there must be a way to get
around this
(maybe some shell scripting?)

Is there anyone out there who has faced a similar issue?

Thanks in advance,
Luis

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