MODEL9.TXT 787 Bytes
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MODEL: CPUE = a + bV + cE

This is a production model combining on the one hand a linear relation-
ship between the CPUE and the fishing effort E, and on the other a
linear relationship between the CPUE and the environmental variable V.
This latter variable is supposed to only influence the abundance of the
stock (surplus production) and not the catchability coefficient.

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After fitting this model, if the value of the parameter  a  is not significantly 
different from zero, it is suggested to try fitting and validating the following 
model which has no intercept parameter (constant term a) but, as a result, has 
more degrees of freedom: 

  CPUE = a V + b E.

For doing this, please use click on "Modelization" and then on 
"Fit a model directly" in the main menu of CLIMPROD.
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