Hi all, This is a fairly simple question, but one that I am unsure of - is it appropriate to fit lines to plots of allometric scores, for example regression score or common allometric component (CAC) vs size, or the first residual shape component (RSC) vs CAC? If the scores represent individuals from different groups or species, does it make sense to add a line of best fit to each group to visualize trends? I've noticed in other papers that lines are not used, so I'm wondering if this is somehow "wrong". I realize the line itself is not the regression line, but if it's only used for visual comparison, is that technically okay?
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