Mike Wierzbicki
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 Nov2 comment Expressing the Venn diagram Also be careful with what you're taking out when you add $(E-C)$. Nov2 comment Expressing the Venn diagram $(A\cap B\cap C)$ is counted in $(A\cap B) + (A\cap C)$ twice, so if you subtract $(A\cap B\cap C)$, you're still left with one. Nov2 answered Finding an inequality for a word problem Nov1 awarded Civic Duty Oct27 revised Are there any (pairs of) simple distributions that give rise to a power law ratio? added note about Dilip's (correct) response. Oct27 comment Are there any (pairs of) simple distributions that give rise to a power law ratio? +1 Nicely done. I didn't bother with fact-checking as my answer was meant more of a 'point-in-the-right-direction' rather than a 'here's-the-solution.' More wise advice from Dilip: fact-check your sources. Oct24 comment What is the following Calculation about? Hi testiii, I converted your math to LaTeX. Can you make sure I copied the problem correctly? Oct24 revised What is the following Calculation about? Inserted LaTeX Oct24 suggested approved edit on What is the following Calculation about? Oct22 comment Stuck trying to prove an inequality @Phira I get $9\leq 2+0+2+2+0+2+2+0+0=10$. Oct22 comment Are there any (pairs of) simple distributions that give rise to a power law ratio? Wise advice. Always check what notation is being used. Oct21 answered Are there any (pairs of) simple distributions that give rise to a power law ratio? Oct21 comment What is the relationship of $\mathcal{L}_1$ (total variation) distance to hypothesis testing? @cardinal I believe you're right. There's another subtle step hidden: $TV(P_0, P_1)=\sup_A (|P_0 - P_1|)$, so you need to convince your self that $\sup_A (|P_0 - P_1|)=\sup_A (P_0 - P_1)$ (which doesn't take much convincing). Oct20 answered The role of writing in understanding concepts Oct20 comment Expected number of draws until the first good element is chosen @MikeSpivey +1 Of course! Serves me right for thinking through the problem too quickly! I'll remove it to avoid confusion. Oct20 answered Values of parameters for which a function is differentiable Oct20 awarded Commentator Oct19 comment $XX^t=A$, $X=?$. Where $X \in \{0,1\}^{n \times m}$ Is your constraint that $\sum_{j=1}^{m}x_{ij}=2$ for the $3\times3$ case, or in general? Oct19 comment Finding a constant k such that P(X+Y) = 0.05 +1. I tried the double integration way and kept getting stuck on my limits of integration (Il-Bhima's solution is basically what I tried to do). Drawing a pic of the problem is often a useful trick to try -- it can really simplify the problem. Oct19 comment Finding a constant k such that P(X+Y) = 0.05 I retract my answer and point you towards: www-stat.stanford.edu/~susan/courses/s116/node114.html The way I wrote it should work, but there was something subtle I was missing.