?So far the all the plots look pretty linear, with just a hint of positive curvature, but it's hard to say because SEs are themselves heteroscedastic.?
The Axxxx SEplots I?m going to send at set 2 and set 3 may be relevant to this matter, for the reason(s) below.
As soon as I started the Axxxx SE plots for set 2 (none of which you?ve yet received), I immediately saw something which you can see for yourself by plotting the two tables at the end of this post, which are for:
a) N_1_a1_S (you already have the plot for this one) b) N_2_a1_S (haven?t sent this one to you yet)
So, as you review the set 2 plots I?m going to start sending you now, please keep an eye out to see whether you think that each new set 2 plot and its corresponding set 1 plot differ in the same way as the plots from the two tables below. If they do, then we may have quite a story to tell about the evolution of the a1 hemoglobins, depending additionally on how the plots pattern at set 3.
Also, one methodological point is worth mentioning ? it may well be that we have to use different sets at different lengths in order to get the most predictive results from our regressions. This is something that has never occurred to me before, but it makes perfect sense if there is any merit to of the ?evolutionary story? that we may be privileged to watch unfold as we step through the set 2 and set 3 plots for the Axxxx SE?s ...