Odds ratio - Revision history

Bradley Monk at 02:29, 23 October 2018

2018-10-23T02:29:52Z

← Older revision		Revision as of 19:29, 22 October 2018
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	The '''odds ratio (OR)''' is ~~a statistic defined as~~ the ratio of the odds of A in the presence of B and the odds of ~~A without~~ the ~~presence~~ of B. This statistic attempts to quantify the strength of the association between A and B.		The '''odds ratio (OR)''' is the ''ratio'' of the ''odds'' of D (Disease) in the presence of V (Variant Allele) and the odds of D (Disease) in the absence of V (Variant Allele). Recall that odds and probability are slightly different in that...

			Ratio: N(D\|V) / ( N(D\|v) + N(D\|~V) )

			Prob: N(D\|V) / ( N(D\|v) + N(D\|~V) )


			This statistic attempts to quantify the strength of the association between A and B.

	If the OR is greater than 1, then A is considered to be associated with B in the sense that, compared to the absence of B, the presence of B raises the odds of A.		If the OR is greater than 1, then A is considered to be associated with B in the sense that, compared to the absence of B, the presence of B raises the odds of A.

Bradley Monk at 23:30, 22 October 2018

2018-10-22T23:30:44Z

← Older revision		Revision as of 16:30, 22 October 2018
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	Often the odds ratio is used to compare the occurrence of some outcome (A) in the presence of some exposure (B), with the occurrence of the outcome (A) in the absence of a particular exposure (absence of B).		Often the odds ratio is used to compare the occurrence of some outcome (A) in the presence of some exposure (B), with the occurrence of the outcome (A) in the absence of a particular exposure (absence of B).

	Two similar statistics that are often used to quantify associations are the '''[[risk ratio]] (RR)''' and the '''[[absolute risk reduction]] (ARR)'''.		Two similar statistics that are often used to quantify associations are the '''[https://en.wikipedia.org/wiki/Risk_ratio risk ratio] (RR)''' and the '''[https://en.wikipedia.org/w/index.php?title=Absolute_risk_reduction absolute risk reduction] (ARR)'''.

	Often, the parameter of greatest interest is actually the RR,		Often, the parameter of greatest interest is actually the RR,

Bradley Monk at 23:24, 22 October 2018

2018-10-22T23:24:14Z

← Older revision		Revision as of 16:24, 22 October 2018
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	RR is the ratio of the probabilities analogous to the odds used in the OR. However, available data frequently do not allow for the computation of the RR or the ARR but do allow for the computation of the OR, as in case-control studies		RR is the ratio of the probabilities analogous to the odds used in the OR. However, available data frequently do not allow for the computation of the RR or the ARR but do allow for the computation of the OR, as in case-control studies

	The OR plays an important role in [[logistic regression]] ([[logit]])		The OR plays an important role in [https://en.wikipedia.org/wiki/Logistic_regression logistic regression] (in the [https://en.wikipedia.org/wiki/Logistic_function logistic function model], aka [https://en.wikipedia.org/wiki/Logit logit model]; see also [https://en.wikipedia.org/wiki/Probit_model probit model], and [https://en.wikipedia.org/wiki/Sigmoid_function sigmoid function])

Bradley Monk at 23:20, 22 October 2018

2018-10-22T23:20:18Z

← Older revision		Revision as of 16:20, 22 October 2018
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	Often the odds ratio is used to compare the occurrence of some outcome (A) in the presence of some exposure (B), with the occurrence of the outcome (A) in the absence of a particular exposure (absence of B).		Often the odds ratio is used to compare the occurrence of some outcome (A) in the presence of some exposure (B), with the occurrence of the outcome (A) in the absence of a particular exposure (absence of B).

	Two similar statistics that are often used to quantify associations are the '''risk ratio (RR)''' and the '''absolute risk reduction (ARR)'''.		Two similar statistics that are often used to quantify associations are the '''[[risk ratio]] (RR)''' and the '''[[absolute risk reduction]] (ARR)'''.

	Often, the parameter of greatest interest is actually the RR,		Often, the parameter of greatest interest is actually the RR,

	RR is the ratio of the probabilities analogous to the odds used in the OR. However, available data frequently do not allow for the computation of the RR or the ARR but do allow for the computation of the OR, as in case-control studies		RR is the ratio of the probabilities analogous to the odds used in the OR. However, available data frequently do not allow for the computation of the RR or the ARR but do allow for the computation of the OR, as in case-control studies

			The OR plays an important role in [[logistic regression]] ([[logit]])

Bradley Monk: Created page with "The '''odds ratio (OR)''' is a statistic defined as the ratio of the odds of A in the presence of B and the odds of A without the presence of B. This statistic attempts to qua..."

2018-10-22T23:18:51Z

Created page with "The '''odds ratio (OR)''' is a statistic defined as the ratio of the odds of A in the presence of B and the odds of A without the presence of B. This statistic attempts to qua..."

New page

The '''odds ratio (OR)''' is a statistic defined as the ratio of the odds of A in the presence of B and the odds of A without the presence of B. This statistic attempts to quantify the strength of the association between A and B.

If the OR is greater than 1, then A is considered to be associated with B in the sense that, compared to the absence of B, the presence of B raises the odds of A.

Often the odds ratio is used to compare the occurrence of some outcome (A) in the presence of some exposure (B), with the occurrence of the outcome (A) in the absence of a particular exposure (absence of B).

Two similar statistics that are often used to quantify associations are the '''risk ratio (RR)''' and the '''absolute risk reduction (ARR)'''.

Often, the parameter of greatest interest is actually the RR,

RR is the ratio of the probabilities analogous to the odds used in the OR. However, available data frequently do not allow for the computation of the RR or the ARR but do allow for the computation of the OR, as in case-control studies