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risk ratio

How to Understand a Risk Ratio of Less than 1

by Audrey Schnell  2 Comments

When a model has a binary outcome, one common effect size is a risk ratio. As a reminder, a risk ratio is simply a ratio of two probabilities. (The risk ratio is also called relative risk.)

Risk ratios are a bit trickier to interpret when they are less than one. 

A predictor variable with a risk ratio of less than one is often labeled a “protective factor” (at least in Epidemiology). This can be confusing because in our typical understanding of those terms, it makes no sense that a risk be protective.

So how can a RISK be protective? [Read more…] about How to Understand a Risk Ratio of Less than 1

Tagged With: binary outcome, predictor variable, probability, protective factor, relative risk, risk ratio

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The Difference Between Relative Risk and Odds Ratios

by Audrey Schnell  27 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

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  • Confusing Statistical Term #8: Odds
  • How to Understand a Risk Ratio of Less than 1
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