Talk:exogenous

wikipeida page could probably be included whole hog

'''Exogenous''' (or ''exogeneous'') (from the [[Greek language|Greek]] words "exo" and "gen", meaning "outside" and "production") refers to an action or object coming from outside a system. It is the opposite of ''[[endogenous]]'', something generated from within the system.

* In an [[economics|economic]] [[model (economics)|model]], an '''exogenous''' change is one that comes from outside the model and is unexplained by the model. For example, in the simple [[supply and demand]] model, a change in consumer tastes or preferences is unexplained by the model and also leads to [[endogenous]] changes in demand that lead to changes in the [[economic equilibrium|equilibrium]] price. Put another way, an exogenous change involves an alteration of a variable that is autonomous, i.e., unaffected by the workings of the [[model (economics)|model]].

* In [[linear regression]], it means that the variable is independent of all other response values.

* In [[biology]], "exogenous" refers to an action or object coming from the outside of a system.  For example, an exogenous contrast agent in medical imaging refers to a liquid injected into the patient [[intravenously]] that enhances visibility of a pathology, such as a [[tumor]].

*In [[biology]], an exogenous factor is any material that is present and active in an individual [[organism]] or living [[cell (biology)|cell]] but that originated outside of that organism, as opposed to an endogenous factor.  
**Exogenous factors in [[medicine]] include both [[pathogens]] and [[therapeutics]].
**[[DNA]] introduced to cells via [[transfection]] or viral infection ([[transduction]]) is an exogenous factor.
**[[Carcinogens]] are exogenous factors.

* The word exogenous is also used in [[geology]]. Exogenous processes are all taking place at the outside of the [[Earth]] and all the other [[planets]]. [[Weathering]], [[erosion]], transportation and [[sedimentation]] are the main exogenous processes.

*In attentional [[psychology]], exogenous refers to [[attention]] being drawn without [[conscious]] intention (see Posner, 1980). An example of this would be attention drawn to a flashing light in the [[periphery]] of [[vision]].

*In [[Ludology]], the study of games, exogenous refers to anything outside the game itself.  Therefore an item in an Massive Multiplayer Online Game would have exogenous value if people were buying it with real world money rather than in game currency (though its in game cost would be [[endogenous]]).

==See also== 
* [[Endogenous]]
* [[Endogenous growth theory]]

If I knew how to format this, I'd do it, but i don't know the structure of this wiki. 70.18.236.229 03:55, 15 June 2007 (UTC)

RFV discussion: July–October 2015

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exogenous

This sense: (economics, of a group) Created by public as opposed to private information. I don't see it in any of the usual major sources (including OED, Merriam-Webster 11th, Random House, or wikipedia). -- · (talk) 05:46, 31 July 2015 (UTC)

I assume this wasn't added by a native English speaker, as I can't work out what it means. Are economic groups created by information? How? Aren't they created by people? Renard Migrant (talk) 16:48, 1 August 2015 (UTC)

It was added in 2008 by User:Klasovsky~enwiktionary, who only made 2 edits ever. It's been edited slightly since then, but his original definition was essentially the same: descriptive of a group created by public as opposed to private information. Doesn't make much sense to me either, but I thought I should rfv it, rather than just delete it, in case someone else can divine what he was getting at. -- · (talk) 19:50, 2 August 2015 (UTC)

• RFV failed. —Mr. Granger (talk • contribs) 19:36, 24 October 2015 (UTC)