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Odds:
The odds of an event happening is the ratio of the number of times
the event happens divided by the number of times it does not happen.
Odds ratio (or):
The odds ratio (or) is the ratio of the odds in one group to the odds in another.
Oneway analysis of variance:
A generalisation of the two sample t test which tests for differences
between three or more group means. The test calculates, amongst other things, the 'variance' between the group means
- hence its name.
See also Analysis of variance, Twoway analysis of variance.
Ordinal data:
When categories have a natural order to them (a hierarchy), eg. improved,
stayed the same, deteriorated. This is unlike categorical data where there is no natural ordering, eg. preferred
colour of car; black, green, silver.
See also Data types.
Outliers:
A value in a sample that is so extreme as to throw question on its validity.
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