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 Feb 26 awarded Yearling Dec 4 awarded Notable Question Sep 24 awarded Autobiographer Aug 4 awarded Notable Question Jul 2 awarded Curious May 26 comment Removing a fixed quantity from multiple “buckets” randomly I actually want to be able to draw from all buckets. The idea is to remove $k$ randomly while being "fair" in the sense that all buckets are removed from (imagine the "elements" are units of money, and the buckets are people). May 26 revised Removing a fixed quantity from multiple “buckets” randomly deleted 19 characters in body May 26 comment Removing a fixed quantity from multiple “buckets” randomly To clarify, I guess one way to do this would be to shuffle all the elements together, remove $k$ randomly, and then put all remaining elements back into their respective buckets (assuming we can distinguish them somehow). May 26 asked Removing a fixed quantity from multiple “buckets” randomly Feb 5 awarded Popular Question Aug 16 awarded Popular Question Apr 16 accepted On norm selection for the solution of an overdetermined linear system Apr 15 comment On norm selection for the solution of an overdetermined linear system Great answer, thanks! Is there any reason why we might want to choose a norm other than L1,L2 or L∞? For example: the "best" norm $p$ (possibly $> 2$) for the given problem, obtained e.g. via the condition number of A? Apr 15 asked On norm selection for the solution of an overdetermined linear system Apr 14 comment Why do we use a Least Squares fit? "So minimising the sum of squares error is equivalent to minimising the distance between the data-point and the prediction-point in the N-dimensional phase space - a very natural way of calibrating our model." Natural, yes, because we are used to reasoning in Euclidean spaces with the associated L2 (Euclidean) norm. There may be (perhaps non-intuitive or "unnatural") mathematical reasons for deviating from this norm towards others. Nov 25 comment Infinite expected value of a random variable The result is quite counter-intuitive. How can summing up products of finite numbers (the values of the random variable) with finite numbers (the probability of the random variable taking on that value) be infinite? Nov 25 asked Various integration theories Nov 17 awarded Commentator Nov 17 accepted Infinite expected value of a random variable Nov 17 asked Infinite expected value of a random variable