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Results tagged with separation
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user 5739
Separation occurs when some classes of a categorical outcome can be perfectly distinguished by a linear combination of other variables.
22
votes
1
answer
2k
views
Model selection with Firth logistic regression
In a small data set ($n\sim100$ ) that I am working with, several variables give me perfect prediction/separation. I thus use Firth logistic regression to deal with the issue. …
- 32.3k
8
votes
1
answer
5k
views
How to describe and present the issue of perfect separation?
Folks who work with logistic regression are familiar with the issue of perfect separation: if you have a variable specific values of which are associated with only one of the two outcomes (say a binary … My question is different from what to do if you have a perfect separation. …
- 32.3k