R help - Apr 2012 - Normalizing linear regression slope to intercept

I am wondering if it possible to normalize the slope of a linear regression to
its intercept to allow for valid between-group comparisons.

Here is the scenario:

I need to compare the slopes of biomass increase among NAFO divisions of
Northwest Atlantic cod. However, the initial division biomass is a confounding
factor that may influence the slope of the regression model. How can I normalize
the slope to the initial biomass of a given division (e.g. 2J3KL)? Normalizing
will allow me to compare the slope of one division to another (e.g. 3NO) with
respect to distance between the divisions without the confounding effect of
division size.

Thanks
Adam Harding

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Adam Harding
Marine Biology & Oceanography
Dalhousie University | Halifax NS


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