# varty

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bio website location age member for 2 years, 1 month seen Dec 29 '11 at 3:49 profile views 52

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 Nov3 awarded Yearling Nov3 awarded Yearling Oct2 awarded Necromancer Dec18 comment How can I calculate a sample size for a ranked list of items across a population? Perhaps, my answer to "Sample size for a variable number of answers" is relevant. Dec7 answered Are those two models equals? Dec7 answered Application of Hidden Markov Model to CRM Dec1 comment Explaining two-tailed tests @chl I agree. However, for a person who is just being introduced to statistical ideas, re-writing the null for a one-tailed test may be a distraction when the focus is on how and why things change with respect to interpretation of the p-value. Dec1 revised Explaining two-tailed tests fixed phrasing Dec1 answered Explaining two-tailed tests Nov30 comment Sample size for a variable number of answers @CarlBenson For a normal distribution the z-value associated with a 95% confidence interval is 1.96. See the wiki link (en.wikipedia.org/wiki/1.96) for an explanation. Let me know if the link does not help and I will add further details to my answer. Nov30 answered Expected number of unseen cards when drawing $2n$ cards from a deck of size $n$ Nov30 comment What happens if a survival curve doesn't reach 0.5? @whuber Shouldn't the question be phrased as: "Does this mean that you can't estimate the median?". Nov30 revised Sample size for a variable number of answers added 1 characters in body Nov30 revised Sample size for a variable number of answers added 1138 characters in body Nov30 comment Sample size for a variable number of answers How did you get to 364? Nov30 awarded Nice Answer Nov30 revised Sample size for a variable number of answers added 273 characters in body Nov30 comment Sample size for a variable number of answers @whuber Oh, I know. At the very least the above approach will get the OP started with something. One can compute margin of errors associated with the probability estimates and use that to compute required sample sizes. For $K=2$ the above collapses to the well known polling problem for which sample sizes are computed using margin of error. I am a bit lazy to actually look at MLE estimates and associated margin of errors! Nov30 answered Sample size for a variable number of answers Nov29 answered Tobit model explanation