regression of the mean

re·gres·sion of the mean

1. if, for a symmetric population with a single mode, a measurement, selected because it is extreme, is repeated, on average the second reading will be closer to the mean than the first.
2. in psychiatry, the tendency for children of exceptional parents to have characteristics of the general population.
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In a regression of the mean wage in 430 occupations of 225 control variables and the fraction female, Filer still finds a substantial wage shortfall for predominantly female occupations.