I did not get much done today. I had useful but frustrating conversations with Teresa Huang (NYU) and Soledad Villar (NYU) about the APOGEE data: We are using the synthetic apogoee spectra (which are part of the data model; released with the observed spectra) to infer (using local linear regression) the temperature derivative of the theoretical spectral expectation. It isn't working! That is, the derivative we get depends very strongly on the number of neighbors we use and how we infer it. Which makes no sense to me. But anyway, there is something I don't understand. Unfortunately, this makes me the blocker on Huang's paper! Argh. I need to compose complicated technical questions for the collaboration.
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