The odds of an event is the ratio of the probability that the event will happen (p) to the probability that it will not happen (1-p).

learn more… | top users | synonyms

0
votes
0answers
23 views

Calculating posterior and prior odds

Question: Now, I'm confused about assigning probabilities here. I find $P(A^c|E) = (.001)(.99) = .00099$ and $P(E|A) = .99$, but what about the first two sentences? Does that mean that $P(E) = .001$ ...
3
votes
1answer
79 views

Odds ratio traps 1 when p value significant

I have a set of imputations on which I'm using PROC GLIMMIX to build a regression model for a binary outcome. I'm using PROC MIANALYZE to roll up the output, part of which includes upper and lower ...
1
vote
0answers
24 views

How do I predict a person's rank given a set of characteristics?

I'd like to predict a person's rank on a list (1 being top ranked, 50 is last -- ties are allowed, i.e., two people can occupy the #2 rank) given a set of characteristics (e.g., age, occupation, ...
2
votes
2answers
227 views

% chance, when the success rate goes up with every failure

In an online game the chance of succeeding at an action starts at 5% and goes up 5% every time the action fails. Upon success the chance resets back to 5%. (So you know how they say a die has no ...
0
votes
0answers
59 views

Odds of winning one of $p$ prizes with $t$ tickets entered

How do you calculate the odds of winning one of 10 prizes if you have $t$ tickets entered in a drawing with $T$ total tickets? Each person can only get one prize. A person with 20 tickets entered ...
3
votes
2answers
295 views

Odds and odds ratios in logistic regression

I am having difficulties understanding one logistic regression explanation. The logistic regression is between temperature and fish which die or do not die. The slope of a logistic regression is ...
7
votes
2answers
294 views

How can I predict the odds that a dodgeball team is going to win based on the winning history of its players?

Imagine there are 80 dodgeball players in the world. Each of them has played thousands of dodgeball games with the other 79 players in more-or-less random order. This is a world without teams (e.g., ...
4
votes
4answers
541 views

Calculating odds for a cricket match

I'm writing a program to help me gamble on cricket, but have run into a wee problem. I've got loads of data from previous games already and have compiled various stats from it. I have calculated that ...
2
votes
2answers
152 views

How to compare whether the odds of success of different levels of a predictor are different from 0

I hope I am able to word my question clearly. Suppose I have a model below: glmer(Y~X + (1|subject), family="binomial", data=dat) The intercept is the log odds ...
2
votes
0answers
175 views

Proportional odds model with random effects

I have a survival data set. I want to see the cluster specific variation, which we usually can do by using Cox proportional hazard model with frailty. But, the constant hazard ratio assumption of Cox ...
2
votes
2answers
111 views

“Exposure” and “Outcome” can be switched without changing the odds ratio?

I'm enrolled in an introductory course in statistics. In one of my lecture notes, the instructor explains why Odds Ratio is popular and he mentions: "Exposure" and "Outcome" can be switched without ...
2
votes
2answers
680 views

Can individual odds ratios be added to get one pooled odds ratio to compare to a reference group?

I have the admission for 4 different hospitals (coded as binary) which are regressed on a list of independent variables. The multinomial logistic provides the odds ratio (O.R.) for independent ...
8
votes
2answers
792 views

Prerequisite for conversion from odds ratio to relative risk to be valid

as question, since we can do the conversion from odds ratio (p1/q1)/(p2/q2) to relative risk (p1/(p1+q1))/(p2/(p2+q2)) fairly ...