Today Storey-Fisher (NYU) and I decided to modify her regression model for understanding galaxies in dark-matter halos from a regression in which we try to predict the properties of the galaxies directly, to a regression in which we try to predict the residuals away from a standard-practice smooth fit based on halo mass. The issues are complex here! But we want to look at simple models, and simple models can't capture the zeroth-order effects. My expectation (to be tested) is that the residuals are better fit by simple models than the zeroth-order trend. Why do I expect this? In my mind it has something to do with linearization.
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