cross-validation, exoplanet spectroscopy

We managed to get some research done in storm-ravaged lower Manhattan: Jake VanderPlas (UW) and I continued to work on cross-validation and its relationship to the Bayes integral. I think we nearly have some conditions under which they compute essentially the same thing. Rob Fergus came over to our undisclosed location at lunch time and we discussed the calibration of his spectrophotometric measurements of exoplanets. He finds (not surprisingly) that the complexity he uses for the PSF model affects the detailed shape of the planet spectra he extracts; this happens because the planets are a tiny, tiny fraction of the total light in the image. We discussed how to express this issue in the paper. It is a kind of systematic error, in some sense.

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