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odds ratio

The Difference Between an Odds Ratio and a Predicted Odds

by Karen Grace-Martin  Leave a Comment

When interpreting the results of a regression model, the first step is to look at the regression coefficients. Each term in the model has one. And each one describes the average difference in the value of Y for a one-unit difference in the value of the predictor variable, X, that makes up that term. It’s the effect size statistic for that term in the model. [Read more…] about The Difference Between an Odds Ratio and a Predicted Odds

Tagged With: marginal means, odds ratio, predicted odds, regression coefficients

Related Posts

  • Logistic Regression Analysis: Understanding Odds and Probability
  • Odds Ratio: Standardized or Unstandardized Effect Size?
  • The Difference Between Relative Risk and Odds Ratios
  • Effect Size Statistics in Logistic Regression

Logistic Regression Analysis: Understanding Odds and Probability

by Karen Grace-Martin  3 Comments

Updated 11/22/2021

Probability and odds measure the same thing: the likelihood or propensity or possibility of a specific outcome.

People use the terms odds and probability interchangeably in casual usage, but that is unfortunate. It just creates confusion because they are not equivalent.

How Odds and Probability Differ

They measure the same thing on different scales. Imagine how confusing it would be if people used degrees Celsius and degrees Fahrenheit interchangeably. “It’s going to be 35 degrees today” could really make you dress the wrong way.

In measuring the likelihood of any outcome, we need to know [Read more…] about Logistic Regression Analysis: Understanding Odds and Probability

Tagged With: logistic regression, odds, odds ratio, probability

Related Posts

  • Confusing Statistical Term #8: Odds
  • The Difference Between Relative Risk and Odds Ratios
  • Effect Size Statistics in Logistic Regression
  • How to Interpret Odd Ratios when a Categorical Predictor Variable has More than Two Levels

Odds Ratio: Standardized or Unstandardized Effect Size?

by Karen Grace-Martin  1 Comment

Effect size statistics are extremely important for interpreting statistical results. The emphasis on reporting them has been a great development over the past decade. [Read more…] about Odds Ratio: Standardized or Unstandardized Effect Size?

Tagged With: effect size statistics, odds ratio, standardized effect size, unstandardized

Related Posts

  • The Difference Between an Odds Ratio and a Predicted Odds
  • Logistic Regression Analysis: Understanding Odds and Probability
  • Effect Size Statistics in Logistic Regression
  • Effect Size Statistics: How to Calculate the Odds Ratio from a Chi-Square Cross-tabulation Table

Effect Size Statistics: How to Calculate the Odds Ratio from a Chi-Square Cross-tabulation Table

by Karen Grace-Martin  Leave a Comment

Lest you believe that odds ratios are merely the domain of logistic regression, I’m here to tell you it’s not true.

One of the simplest ways to calculate an odds ratio is from a cross tabulation table.

We usually analyze these tables with a categorical statistical test. There are a few options, depending on the sample size and the design, but common ones are Chi-Square test of independence or homogeneity, or a Fisher’s exact test.

[Read more…] about Effect Size Statistics: How to Calculate the Odds Ratio from a Chi-Square Cross-tabulation Table

Tagged With: chi-square test, Crosstabulation, effect size statistics, odds ratio, probability

Related Posts

  • The Difference between Chi Square Tests of Independence and Homogeneity
  • How the Population Distribution Influences the Confidence Interval
  • Logistic Regression Analysis: Understanding Odds and Probability
  • Odds Ratio: Standardized or Unstandardized Effect Size?

Member Training: Those Darn Ratios!

by TAF Support 

Ratios are everywhere in statistics—coefficient of variation, hazard ratio, odds ratio, the list goes on. You see them reported in the literature and in your output.

You comment on them in your reports. You even (kinda) understand them. Or, maybe, not quite?

Please join Elaine Eisenbeisz as she presents an overview of the how and why of various ratios we use often in statistical practice.

[Read more…] about Member Training: Those Darn Ratios!

Tagged With: Coefficient of determination, Correlation, Hazard ratio, Likelihood ratio, odds ratio, ratio, relative risk, Variance inflation factor, variation

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  • Member Training: Confusing Statistical Terms
  • Member Training: Interpretation of Effect Size Statistics
  • Member Training: Determining Levels of Measurement: What Lies Beneath the Surface
  • Member Training: Introduction to Stata Software Tutorial

The Difference Between Relative Risk and Odds Ratios

by Audrey Schnell  26 Comments

Relative Risk and Odds Ratios are often confused despite being unique concepts.  Why?

Well, both measure association between a binary outcome variable and a continuous or binary predictor variable. [Read more…] about The Difference Between Relative Risk and Odds Ratios

Tagged With: interpreting odds ratios, odds, odds ratio, relative risk, risk ratio

Related Posts

  • Logistic Regression Analysis: Understanding Odds and Probability
  • Confusing Statistical Term #8: Odds
  • How to Understand a Risk Ratio of Less than 1
  • The Difference Between Logistic and Probit Regression

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