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 Oct28 awarded Good Answer May31 awarded Nice Answer May2 comment How to take derivative of this likelihood function? log$\prod_{i=1}^{n}x_{i}^{y_{i}}=\sum_{i=1}^{n}y_{i}$log$x_{i}$ If you're not sure what to do after that you may need to review partial differentiation. May2 comment How to take derivative of this likelihood function? There is no "product rule" because if $x_{i}$ is multiplied by itself you would have a power rule. If you had a product, all the $x_{j}$ with $j \not= i$ would be constants you could ignore when differentiating. J.M. is saying you don't have a product though. After taking the log you have a sum. Apr20 awarded Yearling Apr9 comment Are these two statements equivalent? This is a case where the translation from logic to standard English is flawed. Special notations exist to avoid this kind of confusion. Travel Agent: I will charge you the full price, unless you cancel at least a week in advance. You (later): I'm not able to go. Give me my refund. Travel Agent: What refund? My statement only specified what would happen if you did not cancel a week in advance. You: What?! TA: You should have interpreted what I said as "I will charge you full price. Unless you cancel a week in advance -- in which case, who can say?" You: Go to hell. Apr20 comment How to solve a cryptarithm? Can we be sure that the second block represents: $\begin{array}{llllll} &&K &(P & E & N) \\ &N &(P & E & N)& \\ I &(P & E & N)&& \\ \end{array}$ and not: $\begin{array}{llllll} &&N &(I & N & K) \\ &E &(I & N & K)& \\ P &(I & N & K)&& \\ \end{array}$ Apr20 awarded Supporter Apr20 awarded Teacher Apr20 revised What's better strategy to handle tons of formulas, definitions? added 1 characters in body Apr20 answered What's better strategy to handle tons of formulas, definitions? Apr20 revised subvolume area under the intersection of a plane (line) and a cone added 50 characters in body Apr20 awarded Editor Apr20 revised subvolume area under the intersection of a plane (line) and a cone added 51 characters in body Apr20 answered subvolume area under the intersection of a plane (line) and a cone