user29163
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 May 29 awarded Popular Question Dec 4 awarded Notable Question Nov 16 answered Fisher information of the Rayleigh distribution Nov 16 comment Fisher information of the Rayleigh distribution I did take them with respect to $x_{i}$'s. I will post the result asap. Nov 16 asked Fisher information of the Rayleigh distribution Sep 18 accepted Prove that a matrix is positive definite and symmetrical Sep 18 comment Prove that a matrix is positive definite and symmetrical Thank you. I will try to work something out. One thing that is certain is that $X^TX$ is symmetric, because $(X^TX)^T = X^T(X^T)^T = X^TX$. By the Spectral theorem, it follows that $X^TX$ can be decomposed into matrices of eigenvectors and eigenvalues. Now I should be able to show $v^TX^TXv \geq 0$ for all vectors v I think. And thank you Karl (below) for providing the hint of transpose of $X^TX$ Sep 17 asked Prove that a matrix is positive definite and symmetrical Jul 2 awarded Curious May 7 comment Prove that the two integrals are equal with periodic function Perfect, thank you. I need to work more with technical arguments like this rather than conceptual ones. May 7 accepted Prove that the two integrals are equal with periodic function May 6 asked Prove that the two integrals are equal with periodic function May 3 awarded Yearling May 3 comment Evaluate limits by interpreting sums as integral sums Thank you, very good answer. May 3 accepted Evaluate limits by interpreting sums as integral sums May 2 comment Evaluate limits by interpreting sums as integral sums What does it mean to interpret sums as integral sums. May 2 asked Evaluate limits by interpreting sums as integral sums Apr 5 comment Wrong way to use MVT to prove inequality Thank you all, I guess it is a good idea to REALLY understand the meaning of the MVT. I rushed to fast into doing problems. Apr 5 accepted Wrong way to use MVT to prove inequality Apr 4 asked Wrong way to use MVT to prove inequality