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...st 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 -- Adam Harding Marine Biology & Oceanography Dalhousie University | Halifax NS [[alternative HTML version deleted]]

I have data that looks like this: > df1 group id 1 red A 2 red B 3 red C 4 blue D 5 blue E 6 blue F I want a list of the groups containing vectors with the ids. I am avoiding subset(), as it is only recommended for interactive use. Here's what I have so far: df1 <- data.frame(group=c("red", "red", "red", "blue",