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Oct
28
awarded  Good Answer
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31
awarded  Nice Answer
May
2
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.
May
2
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.
Apr
20
awarded  Yearling
Apr
9
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.
Apr
20
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} $
Apr
20
awarded  Supporter
Apr
20
awarded  Teacher
Apr
20
revised What's better strategy to handle tons of formulas, definitions?
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Apr
20
answered What's better strategy to handle tons of formulas, definitions?
Apr
20
revised subvolume area under the intersection of a plane (line) and a cone
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Apr
20
awarded  Editor
Apr
20
revised subvolume area under the intersection of a plane (line) and a cone
added 51 characters in body
Apr
20
answered subvolume area under the intersection of a plane (line) and a cone