# Search results

1. ### t, Z and sigma again

Yeah, I think the thing here is you have to recognize that a t-test is a 'likelihood ratio test', or something like that. That is a little opaque so you might have to dig a bit.
2. ### relationship between correlation and average

Yes staring at formulas looks like you'd need some equal variance type assumption as well i think, and then on top of that correlation is at least as large in one population or some combination thereof. Anyway we already agreed that mother Theresa forbids this. Thats too many assumptions so...
3. ### WANTED: Rational Coronavirus Analysis

personally i despise history. why look back when you can wait for the sequel right?
4. ### Permutations are my Samples

glad you like, well if you ever figure out how'd to do this id be interested to hear it.
5. ### relationship between correlation and average

ok, i see what you mean. well i guess most statisticians aren't big on contract law so you have to let me catch up. In the original question discussing the combined population, there is the country itself which could be considered a "sources of happiness", so there's at least one. When...
6. ### WANTED: Rational Coronavirus Analysis

Its interesting to think that violence is sort of infective like virus, another way of man bringing misery on man. I read Cicero was a pompous a-hole. Catiline, now theres a hero. 'How long will you go on testing our patience, oh Catiline'?
7. ### relationship between correlation and average

You know what, I didn't say the trivial solution wasn't allowed, and I think its important to explore these avenues, so it counts. Thats +1 for Joeb33050, so you were both right. Like kissing your sister. Im not really sure how it plays a role here, but lets keep it on the table, you never...
8. ### Permutations are my Samples

I think it is 'rank ordered logits' for this, with 'partial rankings'. unfortunately for you, i have not looked at this type of data in recent memory, so is as far as i can take you on your journey. id bet some of the social science types around here would know.
9. ### relationship between correlation and average

I wonder what if any additional constraints could be placed on the data such that the conclusion that 'the average Swiss person is happier than the average Austrian' would hold. You have to feel that it would not take too much?
10. ### t, Z and sigma again

just google 'neyman-pearson lemma', thats basically how you know t-test is most powerful of its size, as i recall. Could be wrong about that, since it is basically not something to think about to much once you get to runnin' t-tests.
11. ### Need help determining percentage please?

i cant really tell if it is agreeing or disagreeing with my answer. either way looks like now chili recipes forth-coming so im foldin', callin it a day on this one..
12. ### Still having problems...Am I missing something obvious?

im going Probit/logistic regression on this one, I don't see any obvious pairing/ correlation in the experiment? These are probably option as well, especially Poisson, I think may have issues becaue it is bounded on top at 50 as im reeding it? Good luck, and my the stats gods shine their...
13. ### Binary logistic regression warning message model summary help!!

I think that for logit models this is usually caused by a 'plane of complete seperation', ie responses are completely divided by the predictors. That would explain why the recode fixed it. probably the way to go. 'firths method'?
14. ### time series with uniform residuals

hmmmmm, looks like it works out that St is just sum product of t * U_t? t*U is uniform in [0,a*t], seems like? Some googling indicates that that would be hard to evaluate exactly, but im feeling like some asymptotics might simplify things. What are you studying that caused you to encounter...
15. ### t, Z and sigma again

This why stuff is why they gave socrates the hemlock! but good on ya for yo persistance. I guess one way to look at is that the reason 'why' is that t-test is most powerful test for normal data when SD is not known and Z-test is most powerful when it is. if it had been some other test...
16. ### Need help determining percentage please?

The chance his teammate will have at least one of the 2 black 5's, given that one player does not = 1 - the chance his teammate will not have either black 5 = 1 - { choose(41,9)/choose(43,9) } = 40% approx., hopefully I got that right, seems too high, should match 'hypergeometric' probability...
17. ### Brast vs prostate cancer visualisation

total population N got multiplied by two proportions which were relatively constant? throwin' out there....
18. ### Observational Study

Check and mate I guess. Well im ready to wrap this thread up. Question was too vague I think....
19. ### Geometric standard error of the mean

reeewwiiiind. Today on talk stats were taking a look at old problems that didn't quite hit the interests of the day. Looking at these formulas, it appears to stem from the notion that CV_hat ~= X_bar/SD = sqrt( exp( var log(X) ) - 1 ). So their 'ohm' is Var( log(X) ), and you can see that...
20. ### Expectation with confidence

Lets put that to the test... were they the same similiarity? seems important You know, i think this has the flavor of a 'mark recapture' experiment you see in ecology sometimes, and i wonder if similar statistics/methodlogy could not be applied? I say that because you are interested in...