Home > Publications . Search All . Browse All . Country . Browse PSC Pubs . PSC Report Series

PSC In The News

RSS Feed icon

Thompson says LGBT social movement will bring new strength in push for tighter gun control

Yang says devalued pound will decrease resources for the families of migrant workers in Britain

Work by Brown, Ryan, Jackson cited in brief for UT Supreme Court case on race-conscious college admissions

Highlights

Overview of Michigan's advanced research computing resources, Monday, June 27, 9-10:30 am, BSRB - Kahn Auditorium

U-M's Data Science Initiative offers expanded consulting services via CSCAR

Elizabeth Bruch promoted to Associate Professor

Susan Murphy elected to the National Academy of Sciences

Next Brown Bag

PSC Brown Bags
will resume fall 2016

David Lam photo

Comment on Preston and Campbell's "Differential Fertility and the Distribution of Traits"

Publication Abstract

Lam, David. 1993. "Comment on Preston and Campbell's "Differential Fertility and the Distribution of Traits"." American Journal of Sociology, 98: 1033-39.

This article is a comment on "Differential Fertility and the Distribution of Traits" by Samuel H. Preston and Cameron Campbell, the abstract of which is given in the following paragraph. The comment supplies illustrations of how the model proposed by Preston and Campbell works and useful examples of when it may or may not apply. Also included is Preston and Campbell's reply.

A recurrent fear during the past century is that the mean IQ level of populations will decline because persons with lower IQ scores have above-average fertility. Most microlevel data demonstrate such fertility differentials, but population IQ levels have risen rather than fallen. In this article, a simple two-sex model shows that negative fertility differentials are consistent with falling, rising, or constant IQ distributions. Under a wide variety of conditions, a constant pattern of fertility differentials will produce an unchanging, equilibrium distribution of IQ scores in the population. What matters for IQ trends is how the IQ distribution in one generation relates to the equilibrium distribution implied by that generation's fertility differentials. Intuition fails in this important area because it does not account for the macro structure within which micro results must be interpreted.

Browse | Search : All Pubs | Next