Petrie multiplier
The Petrie multiplier is a thought experiment[1] or mathematical model[2] invented by British computer scientist Karen Petrie, and first described by Ian Gent in 2013.[3] The multiplier "shows that if the percentage of men and women in the room who make questionable remarks to the other sex is equal, then the average number of sexist remarks experienced by members of one party scales by the square of the proportion of the offending party to the other.
Mathematical formulation
Gent defined the multiplier in the following terms:[3]
With 20% women the gender ratio is 1:4. So 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. But there are 4 times fewer women to receive sexist remarks, so each individual woman is four times as likely to receive a given remark than an individual man is. These effects multiply, so in this example 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 Petrie multiplier corresponds to
Expanded model
The model assumes that men and women are equally sexist. Further, each sexist remark made by a man is assumed to randomly target one of the women and vice versa.
The Petrie multiplier has not been the subject of any
References
- ^ Petrie, Karen (27 November 2013). "Attack on sexism not an attack on men". The Scotsman. Retrieved 5 July 2017.
- ^ Butterworth, Jon (9 March 2015). "A mathematical model of oppression: the Petrie Multiplier". The Guardian. Retrieved 5 July 2017.
- ^ a b Gent, Ian (13 October 2013). "The Petrie Multiplier: Why an Attack on Sexism in Tech is NOT an Attack on Men" (blog post). Retrieved 5 July 2017.
- ^ S2CID 123368257.
- ^ a b Massey, Bart (4 February 2014). "The Petrie Multiplier". Archived from the original (blog post) on 1 July 2016. Retrieved 5 July 2017.
- ^ Chart, David (20 October 2013). "The Petrie Multiplier" (blog post). Retrieved 5 July 2017.