Skip to Main Content
banner NOAA logo            NOAA's National Marine Fisheries Service
            NOAA Fisheries Toolbox

row of waves


 Model List

An Index Method

Line Art Drawing of a Fish

An Index Method


|  About  |  Downloads  |  Version History  |



Version 2.5.0 (January 2014)

Research Model


An Index Method (AIM) allows the user to fit a relationship between time series of relative stock abundance indices and catch data. Underlying the methodology is a linear model of population growth, which characterizes the population response to varying levels of fishing mortality. If the underlying model is valid, AIM can be used to estimate the level of relative fishing mortality at which the population is likely to be stable. The index methodology can used to construct reference points based on relative abundance indices and catches and to perform deterministic or stochastic projections to achieve a target stock size.


AIM was developed by Dr. Paul Rago at the NMFS Northeast Fisheries Science Center.


Back to Top 


Version History


AIM Version 2.2 (October 2010)

  • The new version adds Envelope Analysis as a new feature after the basic AIM calculations have been performed.

AIM Version 2.1.1 (September 2009)

  • Upgraded to Visual Studio 2008 and Microsoft .NET framework

  • Sensitivity Analysis on the numbers of years used to smooth Indices of Abundance and Relative Fishing Mortality.

  • Chi Squares Test


AIM Version 2.0.2 (June 2008)


AIM Version 1.5 (April 2007)

  • Includes a new grid editing tool with easier data entry and copy/paste abilities. 

  • Ability to save files with spaces in the file name, and use spaces in folder names.

  • Upgraded version of the plotting package.



Back to Top 


NOAA Fisheries Toolbox Version 3.1

website last modified May 16, 2016


Printer friendly view

Link disclaimer | Email webmaster | Privacy policy |     File Modified Mar 28, 2008