# Tagged Questions

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).

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### Odds ratio confidence interval using bootstrap

I have model with four predictors in logistic regression and sample size 39 (6 positive patients and 33 negative). When I perform logistic regression with bootstrap method it gives me b coefficient ...
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### all dependent and independent variables are categorical

I have 2 categorical dependent variables and 1 categorical independent variable. By which regression model I can calculate odds ratio? For example the dependent variables are the cancer stages (0-4),...
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### Odds ratio in multivariate GLM

How to calculate odds ratio in multivariate GLM? I selected parameter estimation in option but the outcome didn't show EXP(B).
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### Interpretation of coefficients in logistic regression output

I am doing logistic regression in R on a binary dependent variable with only one independent variable. I found the odd ratio as 0.99 for an outcomes. This can be shown in following. Odds ratio is ...
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### Compare predictive power of 1 model on different data

I would like to test if the odds of bets on football matches with higher betting volume are more efficient (i.e. predict the result better) than bets with lower betting volume. I use a probit model ...
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### Why use odds and not probability in logistic regression?

Why would we use odds instead of probabilities when performing logistic regression?
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### Question regarding odds and odds ratios

I wonder if having multiple groups (race: white, asian, black, hispanic), can I calculate odds ratios for these groups. The data are encoded as nominal variables (0,1,2 etc.) I have a $4 \times 2$ ...
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### Odds on dice with 5-sided die

If a die with only 5 sides was tossed 5 times, Would the odds of a "5" coming up 5 times in succession be .2 to the fifth power or .00032? Would the odds of any one number coming up 5 times be ....
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### How do I calculate the tipping point of over/under odds in Football?

I am trying to understand how game odds work. One scenario I came across was the over/under scores for football (soccer) games in the form of a table like this: ...
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### How to compare predictive power of sports odds

For my MSc Thesis I would like to compare the predictive power of classic bookmakers on the one hand and a betting exchange on the other. I have a lot of data on both types of betting, mostly on ...
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### Probability of Multiple Events Occuring

I was just wondering if you could point me in the right direction in calculating the best way to calculate the odds of two or three events occuring in order to work out the probability in percentage? ...
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### How to derive likelihood of an event from probability values? What's the difference/relation between odds and likelihood?

I am trying to understand the relationship between probability, odds, logit values and likelihood. Is there any?
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### A statistical interaction is significant, but the author denies it. Why?

I am evaluating a journal article regarding its statistical interactions. The article is trying to establish a relationship between less-tight control of blood pressure and progression to severe ...
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### Does logistic regression determine the direction of the association?

I've conducted a logistic regression in which a binary outcome was the dependent and some continuous factors were entered as independent variables. First: Can this model determine that the ...
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### nested logit interpret coefs

how do I get the odds ratio from a coefficient of a nested logit. I know for multinomial logit, the exp of the coeff of a binary independent variable is the odds ratio. is that true for nested logit?
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### Odds of impostor?

Assume I left a hotel room key at the concierge to be picked up by my friend John Doe. The key is put in an envelop, "John Doe" is written on the outside of the envelop, and the people at the ...
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### Does having a significant result from chi-squared test for independence also means that the odds ratio is significantly different from 1?

Suppose I have 2 by 2 contingency table. I performed Pearson's chi-squared test for independence and the results are significant. Does that mean the odds ratio that I calculated based on the 2 by 2 ...
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### Ran a logistic regression and calculated the probabilities but they appear too high

I ran a logistic regression in R using driving data from about 10,000 people. The model included age, years of driving experience, as well as 4 driving test results. The dependent variable was whether ...
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### Probability that Secret Santa arrangement will result in perfect pairings

So, we had Secret Santa at work. We're 8 people. We each took turns and pulled a small piece of paper from a bowl with a name on it. The only rule : If you pull your name, you have to put the piece ...
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### Office raffle pooling (random stats question)

I have a question that has been bothering me about the statistics of a raffle drawing we had at a holiday party today. There were 65 prizes and 150 participants. Each time a winner is selected, that ...
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### Logit: why aren't my exponentiated coefficients equaling my odds ratio (for nominal predictors)?

I'm running logit in JMP. My understanding is that if you exponentiate the coefficients, you get the change in odds ratios from a 1 unit change in X. This works perfectly for continuous independent ...
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I am having some trouble in understanding odds, and I would like just a basic explanation for how to interpret them. I have found various posts related to odds but most of them are more complex than ...
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### Significance between odd ratios

IÂ´m fairly new to the tools of statistics and I need some help. IÂ´m working in R. I have a list of students, their age, sex, test results(continuous variable) and education (a categorical variable. 0 ...
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### How can I explain proportional odds models to a layman?

I'm writing an interdisciplinary research paper and I'm having some troubles in clearly explaining my findings. In particular, I applied a proportional odds model with one regressor $x$ and three ...
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### Differences between logistic regression parameter estimates and Cox-proportional hazard parameters

We have been working on a survival analysis. We are examining tree seedling survival over a decade with annual to biannual census intervals. We have been using the package coxme in R for a mixed ...
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### How to convert sport odds into percentage?

I am wondering how to convert sport odds to the percentage format. There's this example: ...
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### Interpretation of Odds in Probit Regression

Logistic regression is concerned about modelling log-odds, i.e. logits. Hence, the odds of the computed probabilities can be interpreted accordingly. However, when estimating a probit model, one could ...
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### Relationship between $\beta_1$ and odds in simple logistic regression

I am taking a course in logistic regression, and currently my class is about to finish our discussion about simple logistic regression. My professor said that the following statement is correct: ...
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### Odds vs. Probabilities (Confusion)

In logistic regression, I know that Odds and Probabilities are two different things, but still I can't distinguish between them. I will be very grateful for your clarifications.
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### What are the odds of this happening?

There is a list of exactly 94 names on it. One person randomly picks 5 names on the list and doesn't show them to anyone. Another person picks just 2 names on the list. What are the odds that one of ...
I have a logistic regression model, where one of my variables is logged. It is of the following form: $\ln(\frac{p}{1-p}) = B_1\ln(X) + B_2Y + ... + \epsilon$ , where $\epsilon$ is an error term. I ...