barrycarter
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 Mar 16 comment Earth population growth rate is exponential or logarithmic? "barrycenter" is my cool new nickname :) Mar 16 comment another follow up question: modeling with exponential distributions Hint: if I'm doing the math right, Naomi's total time simplifies to 3/(lam1+lam2) Mar 15 comment Earth population growth rate is exponential or logarithmic? "nobody is modelling [...] exponential, quadratic , cubic, linear". Literally a contradiction as @A.S. notes. Mar 15 comment Earth population growth rate is exponential or logarithmic? If you have n points, you can always find an n-1 degree polynomial that matches those points exactly. In theory, you could have 3 points that match an exponential function and a quadratic at the same time (the function only has to agree with your data at 3 points, not everywhere). My main question: are you looking for an exact match or an approximate match? Mar 15 comment Applying a general function an infinite number of times en.wikipedia.org/wiki/Iterated_function may or may not be helpful Mar 15 comment Find Nth Term of Sum Of Digits If OEIS doesn't have a closed form, I'm guessing you'll be hard pressed to find one. Mar 15 comment CDF expected value when Y=X^2 As @AndréNicolas notes, the square root actually has two values, so $P\left(X\leq \sqrt{Y}\right)$ isn't strictly correct. Mar 15 comment Earth population growth rate is exponential or logarithmic? The "i am assuming 3" is throwing me off. If you have 100 data points, it's still possible they are close to being quadratic, even if they are not exactly so. Just to confirm, you're looking for "best match" not a perfect fit, correct? Mar 11 comment Finding an angle in a triangle, when the length of one side is unknown and the distances from each vertex to an arbitrary point is known Answer corrected. Mar 11 revised Finding an angle in a triangle, when the length of one side is unknown and the distances from each vertex to an arbitrary point is known corrected answer Mar 11 comment Finding an angle in a triangle, when the length of one side is unknown and the distances from each vertex to an arbitrary point is known Ugh, you're right! I knew that flipping A and N at the last second was a bad idea... I'll fix this shortly. Mar 11 revised Finding an angle in a triangle, when the length of one side is unknown and the distances from each vertex to an arbitrary point is known minor grammra Mar 10 answered Finding an angle in a triangle, when the length of one side is unknown and the distances from each vertex to an arbitrary point is known Mar 8 comment Whether or not to use Markov's formula As others have noted, Markov's inequality does not apply to P(something) = something, only P(something) > something, and, by extension P(something) < something. You really should be able to solve this wo Markov's inequality though. Mar 8 comment Intersection of two ellipses Show us at least some work first. Perhaps start with the equations for the two ellipses? Mar 8 comment Line $mx + ny = 3$ is normal to the hyperbola $x^2 – y^2 = 1$ Remember that the line has to touch the hyperbola at some point as well. Mar 8 comment Boolean x'.y+x.y' solution Hint: (x and not Y) OR (NOT x AND y) Mar 8 comment Finding an angle in a triangle, when the length of one side is unknown and the distances from each vertex to an arbitrary point is known So you're looking for a single solution that works regardless of whether S is in the triangle, outside the triangle, or on one edge of the triangle? Mar 5 comment Sum of a particular Series If it helps, Mathematica can't find a closed form for this sum or the equivalent integral. Mar 5 comment How to find probability of the best choose? en.wikipedia.org/wiki/Secretary_problem but it was called the beauty contest problem when I first heard about it.