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Petrie Multiplier
The Petrie Multiplier〔Karen Petrie, ''Attack on sexism not an attack on men'', http://www.scotsman.com/news/attack-on-sexism-not-an-attack-on-men-1-3209552〕〔Aileen Robertson, ''Sexism in tech jobs explained by Dundee University lecturer,'' http://www.thecourier.co.uk/news/local/dundee/sexism-in-tech-jobs-explained-by-dundee-university-lecturer-1.142196〕 is a thought experiment by Karen Petrie that reveals that a minority of women in a group will experience a disproportionate amount of sexist interactions even if men and women in the group are equally sexist. This effect was named and popularized by Ian Gent〔Ian Gent, ''The Petrie Multiplier: Why an Attack on Sexism in Tech is NOT an Attack on Men'', http://iangent.blogspot.co.uk/2013/10/the-petrie-multiplier-why-attack-on.html〕 who explained that if there are four times as many men in a group "there are 4 times as many men to make sexist remarks, so 4 times as many sexist remarks are made to women as to men." There are also four times fewer women to receive those sexist remarks so "the mean number of sexist remarks per woman is 16 times the number per man. This holds in general, so with a gender ratio of 1:r, women will receive r2 times as many sexist remarks as men".〔 The importance of the Petrie multiplier is that it shows how women can correctly perceive that women are insulted more frequently in technology, without it being necessary that men are in general more sexist than women.
The multiplier effect is identical to that operating in Lanchester's laws, where its cumulative attritional effect over time is known as the "square law".
==Illustration ==
The image shows an animation of the Petrie Multiplier.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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