# log-odds

CEFR C1 · Noun

Source: https://englishreference.com/word/log-odds
Updated: 2026-09-28

## Definition

the mathematical logarithm of the odds of an event occurring, used to make probabilities easier to work with.

For teachers: the natural logarithm of the ratio of the probability of an event to the probability of its complement, mapping probabilities from the unit interval to the real line.

## Examples

- Logistic regression calculates the log-odds of a student passing the examination.
- In binary classification, a decision boundary occurs where the log-odds equal zero.
- Updating linear weights in logistic models adjusts the log-odds additively, simplifying the Bayesian accumulation of evidence.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.