I gave the Königstuhl Colloquium in Heidelberg today. I spoke about the (incredibly boring) subject of selecting targets for spectroscopic follow-up. The main point of my talk is that you want to select targets so that you can include the selection function in your inferences simply. That is, include it in your likelihood function, tractably. This puts actually extremely strong constraints on what you can and cannot do, and many surveys and projects have made mistakes with this (I think). I certainly have made a lot of mistakes, as I admitted in the talk. Hans-Walter Rix (MPIA) and I are trying to write a paper about this. The talk video is here (warning: I haven't looked at it yet!).
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