Zoë Clark
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 Apr 30 awarded Popular Question Oct 1 awarded Yearling Jul 23 answered Work out if the relationship between 2 datasets is constant Jul 22 answered Probability notation P versus Pr Jul 2 comment given lognormal distribution, find expected value of its function Try using the rule of the lazy statistician: Let $Y = r(X)$ for a function $r$, then $E(Y) = E(r(X)) = \int r(x)f_X(x)dx$. Jun 26 answered Beta distribution for exam P? May 28 comment Markov Chain transitional probability query. I'm confused by your notation. What does $P^2 \ entry (1,1)$ mean? Dec 30 comment Normal Distribution from Standard Deviation? If you have $\sum xy$ you can estimate the covariance between $X$ and $Y$ like this: $\tfrac{1}{n - 1} \sum xy - \bar{y} \sum x - \bar{x} \sum y + \bar{x}\bar{y}$. The sample means are the center of your estimated two-dimensional normal distribution. Dec 28 comment Algebraic manipulation of probability distributions Thanks. I've edited the post to reflect a more general question. Any thoughts on that? Dec 28 awarded Scholar Dec 28 accepted Algebraic manipulation of probability distributions Dec 28 revised Algebraic manipulation of probability distributions added 124 characters in body Dec 27 comment Algebraic manipulation of probability distributions Thanks @MichaelHardy. To clarify, I'm referring to the $\exp\{-x/\beta\}$ version. Dec 27 asked Algebraic manipulation of probability distributions Dec 26 awarded Teacher Dec 26 answered Normal Distribution from Standard Deviation? Dec 21 awarded Editor Dec 21 revised Existence of a UMP test for two binomial random variables Karlin-Rubin, not Neyman-Pearson Dec 21 asked Existence of a UMP test for two binomial random variables Nov 8 awarded Supporter