johnny
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 Mar 30 awarded Yearling Mar 30 awarded Yearling Feb 9 awarded Enlightened Feb 9 awarded Nice Answer Dec 21 awarded Nice Question Nov 12 comment Variance of function-valued random variables Bosq "Theory of linear processes in function spaces". Jul 2 awarded Curious Mar 30 awarded Yearling Jan 6 comment New Year challenge +1. I find this to be a very intuitive and pedagogic approach! Nov 18 revised ordinary least square regression added 8 characters in body Nov 18 answered ordinary least square regression Nov 18 comment ordinary least square regression Ordinary least squares is not the answer here because you have heteroskedasticity. Since its known in advance, is there any way to rewrite the model so it disappears? (Hint: yes, there is.) If you have seen it, think of generalized least squares. Nov 9 comment Different meanings of math terms in different countries In French, variété stands for a manifold. And you need to really say variété algébrique to eliminate the confusion. Oct 9 comment Math question from the GMATprep If you're short on time, such questions can be answered with just looking at a one particular case (or two as in this answer). Since question implies that a single value is obtained whenever $xy=1$, you can plugin anything that works, e.g. $x=1$ or $y=1$, and assume that it remains the same for other cases. Use this at your own risk however. Oct 9 answered Math question from the GMATprep May 20 comment How to evaluate the integral $\int e^{x^3}dx$ Unless there's a minus sign in the exponential, the statement is false. May 19 awarded Constituent May 7 awarded Caucus Apr 11 revised Matlab code for generating random symmetric positive definite matrix added 18 characters in body Apr 11 comment Matlab code for generating random symmetric positive definite matrix That is Matlab code! But you may or may not have Statistics toolbox. Try running 'wishrnd(eye(10),10)'. If it works, good for you.