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Odds ratio

odds ratio

(Science: epidemiology) A comparison of the presence of a risk factor for disease in a sample of diseased subjects and non diseased controls. The number of people with disease who were exposed to a risk factor ( I.e. ) over those with disease who were not exposed ( Io ) divided by those without disease who were exposed ( ne ) over those without who were not exposed ( no ). Thus OR=(I.e./Io)/(Ne/No)= I.e. No / Io Ne. This measure should be used for case control studies where we retrospectively look at risks in those with and without disease. Also known as exposure odds ratio.

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Re: Re:

... am saying. As the variation associated with environment increases, the odds ratio approaches 1:1, a 50/50 split of probability regarding which group is overall genetically ...

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by wildfunguy
Thu Mar 13, 2014 4:13 am
Forum: Human Biology
Topic: Brain size=IQ level theory (Blacks vs Whites & Asians)
Replies: 75
Views: 332669

Gene Frequency

Genetic equilibrium means that the ratio of alleles is not changing between generations, but it has nothing to do with ... so we must use the allele frequencies of those populations to determine the odds. NOTE: probability grids only work when the two variables are independent of ...

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by wildfunguy
Fri Sep 07, 2012 11:25 am
Forum: Genetics
Topic: Gene Frequency
Replies: 8
Views: 9824

Odds Ratio??

Hey, I know the calculation for "odds ratio" is: (A/B) (C/D) which is then rearranged to: (AxD) (BxC) This is the question: 6) An epidemiological ...

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by TwinkleK
Sat Jan 14, 2012 5:29 pm
Forum: General Discussion
Topic: Odds Ratio??
Replies: 1
Views: 1055

A Monkey's Uncle

... or mitochondrial to nucleic mammal. The mass-roosting and migration behavior is a very effective survival mechanism, as it decreases predation ... Such behaviour does not decrease predation rates it only enhances the odds that the individual will not be eaten. In fact, where huge food sources ...

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by AstusAleator
Wed Mar 14, 2007 7:01 am
Forum: Evolution
Topic: A Monkey's Uncle
Replies: 26
Views: 62714

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