Add nested selectivity for BSFRF survey

[jimianelli]

Andre's version added the ability for selectivity for one gear to be nested within that of another gear has been added (so that the selectivity for the NMFS survey can be nested within that of the BSFRF survey, as is the case for BBRKC Model and snow crab).

[smartell]

Not sure I understand what you mean by nested selectivity

On Thu, Oct 4, 2018 at 7:37 AM Jim Ianelli notifications@github.com wrote:

Andre's version added the ability for selectivity for one gear to be nested within that of another gear has been added (so that the selectivity for the NMFS survey can be nested within that of the BSFRF survey, as is the case for BBRKC Model and snow crab).

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[wStockhausen]

In a side-by-side (SBS) experiment, BSFRF selectivity is assumed to be 1, so the estimated "selectivity" function (which reflects the relative probability of capture-at-size by a survey in relation to the entire stock) really reflects the availability of crab in the SBS area relative to the total stock area. Within the SBS area, the NMFS survey selectivity is assumed to reflect the conflation of availability relative to the total stock area (i.e., the BSFRF "selectivity") and the NMFS survey selectivity relative to the entire stock. Hence, NMFS survey selectivity relative to the total stock is "nested" within the BSFRF survey "selectivity" in an SBS area.

Buck

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• Dr. William T. Stockhausen *

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• Resource Ecology and Fisheries Management *
• Alaska Fisheries Science Center *
• National Marine Fisheries Service *
• National Oceanic and Atmospheric Administration *
• 7600 Sand Point Way N.E. *
• Seattle, Washington 98115-6349 *

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• email: William.Stockhausen@noaa.gov *
• voice: 206-526-4241 fax: 206-526-6723 *
• web : http://www.afsc.noaa.gov *

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  All models are wrong, some are useful.--G.E.P. Box Beware of geeks bearing equations. --W. Buffett

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  Disclaimer: The opinions expressed above are personal and do not necessarily reflect official NOAA policy.

On Thu, Oct 4, 2018 at 9:01 AM Steve Martell notifications@github.com wrote:

Not sure I understand what you mean by nested selectivity

On Thu, Oct 4, 2018 at 7:37 AM Jim Ianelli notifications@github.com wrote:

Andre's version added the ability for selectivity for one gear to be nested within that of another gear has been added (so that the selectivity for the NMFS survey can be nested within that of the BSFRF survey, as is the case for BBRKC Model and snow crab).

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.

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