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What does it mean if the odds ratio is 0?
Odds-ratio The odds ratio takes values between zero (“0”) and infinity. One (“1”) is the neutral value and means that there is no difference between the groups compared; close to zero or infinity means a large difference.
What does it mean if the odds ratio is less than 1?
When the odds ratio is lower than 1, the likelihood of having the outcome is XX% lower (XX% = 1-Odds ratio). For e.g. if odds ratio is 0.70, then there is a 30% lower likelihood of having the outcome. The odds ratio also shows the strength of the association between the variable and the outcome.
Can you have an odds ratio of zero?
If you have an infinite odds in the denominator, then your odds ratio is zero. Finally, if you have a zero odds in the denominator, then your odds ratio is infinite. The only case you can’t handle is when both groups have 100% survival or 0% survival.
What are the coefficients of a dummy variable?
So the coefficients on dummy variables measure the average difference between the group coded with the value “1” and the group coded with the value “0” (the “default” or “base group” )
How are dummy codes affect interpretation in logistic regression?
How Dummy Codes affect interpretation in Logistic Regression. In logistic regression, the odds ratios for a dummy variable is the factor of the odds that Y=1 within that category of X, compared to the odds that Y=1 within the reference category.
What is the odds ratio for condition 1?
So the odds ratio for condition 1 is a ratio of the odds of answering correctly in condition 1 compared to the odds of answering correctly in condition 6. The odds ratio for condition 2 is the ratio of the odds of answering correctly in condition 2 compared to condition 6.
How to interpret odd ratios when a categorical predictor?
The odds ratio for condition 2 is the ratio of the odds of answering correctly in condition 2 compared to condition 6. This way of coding works especially well if condition 6 is the control condition.