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N4v
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Linearly Regressing Pooled Data

I'm trying to regress some simple pooled data. My data has 60 observations and three columns: Weight, Height, and Sex (female=1, male=0).

If I regress thus, Weight ~ Height + Sex, my model is fairly satisfactory, but the residuals are not homoscedastic (green errors are male, blue female):

plot http://i1267.photobucket.com/albums/jj541/nbahmanyar/Rplot_zps69001b34.png

I tried regressing on the log of Weight and/or Height, but that didn't do much. What should I do to make the residuals homescedastic and/or make my model more accurate? Any help would be appreciated.

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N4v
  • 155
  • 5