On the weekend, Kate Storey-Fisher (NYU) and I implemented jackknife uncertainty estimation for KSF's cosmology-with-Gaia-quasars project. We jackknifed by cutting the sky into RA slices. This is standard practice but I don't love it! It assumes that you know that your main source of error is calibration or sample consistency over the sky. It might be something way more insidious. In principle I guess you should jackknife over many things, and also randomly.
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