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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Natural Resource Management: How do I estimate the odds ratio and confidence intervals from model-averaged estimates?

I'm currently working on a model selection analysis in the field of natural resource management. My research question is: what variables are important to an avian species nest site selection. My ...
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53 views

Odds or Odds Ratio terminology?

I am having a bit of a tough time with some logistic regression terminology. I have performed a multivariable logistic regression analysis where I have regressed a binary variable (death, where 1 = ...
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67 views

Probabilities vs. Odds Ratios

Suppose we know that the probability of a female getting into a program are $p=.7$ and $q=1-.7=.3$ for males. Then we know: $$\mbox{odds}(\mbox{female}) = .7/.3 = 2.33333$$ ...
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14 views

Relating odds to percentages

Suppose I have a logit model with the response variable admission. The odds ratio for the one of the variables, test score, is 1.228. Then for 1 unit increase in test score, the odds of being admitted ...
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89 views

If each airline flight has a 2.6 in 1,000,000 and a person goes on 1000 flights, what are the odds for that person?

I would like to understand the way to calculate this particular problem. I understand that each flight still has a 2.6 in 1M chance of accident. But a person who takes more flights would seem to be ...
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25 views

What are the odds of only winning a lottery once when there is a 1 in 3 chance of winning with each draw and you have 20 draws?

Lottery chance to win is 1 in 3. I have 20 changes. I only win 1. What is the statistical probability of this outcome?
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49 views

Just curious of the odds of this happening

Was having lunch with a lover on the boardwalk and he pulled a random couple off of the boardwalk to have lunch with us. As we were talking, we discovered that both men had the same birthday, and the ...
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16 views

how expected innings runs are converted into match odds in cricket

How to convert two teams expected innings runs into match odds and their win probability in cricket. Let's consider that,I had worked out past records of both the teams and calculated their expected ...
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22 views

Is ıt possible to fit a proportional model by hand?

I was asked to solve the question below by hand as a homework. I did it in R, but I think it is impossible to build the model by hand as one needs to conduct numerical analysis to obtain the betas. Am ...
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13 views

Odds Ratio- calculated vs. reported unadjusted

Why would the odds ratio that I calculated be different than a reported unadjusted odds ratio? Does sample size have anything to do with this?
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34 views

Calculate betting odds algorithm book [closed]

I'm just wondering, is there any book with good explanation of betting odds calculation algo. Good example is, tennis or poker. After each shot, or next opened card, the odds are changing. And I want ...
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27 views

Mean residual lifetime divided by odds of survival?

Is there a name for the mean residual lifetime divided by odds of survival? Does it have an intuitive meaning or interpretation? Example: $P(X=\{0,1,2,3\}) = (0.40, 0.30, 0.2, 0.1)$ ...
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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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0answers
122 views

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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5answers
355 views

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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1answer
73 views

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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3answers
46 views

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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39 views

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 ...
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30 views

Interpretation of logged term in logit (generalizing previous answers)

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 ...
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75 views

Interpreting Odds Ratios for Natural Log transformed Variables

For those who are using Stata the following command clogit Y X,or would produce the odds ratio from the Conditional logistic regression which is the change in the ...
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1answer
80 views

Looking for a layman's explanation of how to manually calculate log odds?

I will start that I am not as math oriented as I would like to and could use a layman's / non-staticians explanation walk through of how to calculate the log odds. I am reading Hosmer, Lemeshow, and ...
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0answers
35 views

Odds of a team winning a sports match given full history

Assumptions: The teams never change The teams don't improve in skill The entire history of each team's performance against some subset of other teams is known For example: I have a long list of ...
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2answers
67 views

Do odds increase over time based on brute force?

Attempting to understanding a statistical concept which I'm positive is basic stats, but that I currently don't understand. Say that there's a one in ten million likelihood of an outcome happening ...
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1answer
867 views

What is the difference between logistic and logit regression?

What is the difference between logistic and logit regression? I understand that they are similar (or even the same thing) but could someone explain the difference(s) between these two? Is one about ...
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1answer
102 views

Winning Poker criteria in PLO against a player who always raises

I was considering an interesting situation. Imagine you are playing poker against someone who is always raising in a tournament game (both start with a stack of chips, and win when they have the other ...
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1answer
96 views

Logistic Regression Odds Interpret

I was analyzing the different treatments applied to products. It started out with a a plethora of variables but I came to the conclusion that I can essentially only control the treatment applied so I ...
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22 views

Odds Ratio in 2*3 Table

How can calculate Odds Ratio in 2*3 Table ( Participante [case -control] and marker [genotype])?
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256 views

Interpretation of clogit coefficients (Survival package in R)

Still very very new to R! I've run a conjoint (choice) experiment that uses the function clogit. Output as follows: (this model has been obtained through stepwise methods) ...
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38 views

Calculating Stocks/Shares Odds

I am interested in the calculation of odds for stocks. For example, sports odds are like so: Turkey vs Ukraine hwin, draw, awin 2.20 3.40 3.20 2.20 for a ...
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181 views

Alternatives to proportional odds mixed effects models

I was doing some reading about categorical data analysis (e.g. Agresti (2010): Analysis of Ordinal Categorical Data). Additionally to analysing data with an ordinal response with the help of ...
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1answer
46 views

Interpreting odds in a logistic regression

I am having some problems interpreting the odds. I run a logistic regression for an out come 'Yes' or 'no'. My reference category is 'No'. I have 2 variables and this are the log(odds) and the odds: ...
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235 views

Statistics of 7 game playoff series

Background: a friend of mine makes a hobby (as I imagine many do) of trying to predict hockey playoff outcomes. He tries to guess the winning team in each matchup, and the number of games needed to ...
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1answer
269 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 ...
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34 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, ...
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2answers
639 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 ...
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82 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 ...
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2k 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 ...
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451 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., ...
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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 ...
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2answers
191 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 ...
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289 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 ...
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2answers
161 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 ...
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2answers
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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 ...
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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 ...