got an out-of-sample R^2 of -5.8 the other day somehow hadn't occurred to me that was possible but now I'm curious how far I can push it
Take 1-(RSS/TSS) Model fit is worse than a constant at the mean of the dependent variable Possible, because model fit on separate data
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oh, right, out-of-sample. yeah that is actually impressively bad!
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you can make it arbitrarily large. Estimate sample mean with N=1, choose out-of-sample N=1 arbitrarily far away
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