Lynn (2010) suggests that differences in average intelligence explain many of the differences observed across the Italian regions. This paper puts forward a methodological critique to his study, coupling it with an empirical test showing that Lynn's analysis is not sufficiently robust to support its conclusions. (Contains 2 tables.)

Beraldo (2010) and Cornoldi, Belacchi, Giofre, Martini, and Tressoldi (2010) (CBGMT) have eight criticisms of my paper (Lynn, 2010) claiming that the large north-south differences in per capita income in Italy are attributable to differences in the average levels of intelligence in the populations. CBGMT give results for seven data sets for IQs in…

The impetus for our study was the contention of both Lynn [Lynn, R. (1991) "Race differences in intelligence: A global perspective." "Mankind Quarterly," 31, 255-296] and Rushton [Rushton, J. P. (1995). "Race, evolution and behavior: A life history perspective." New Brunswick, NJ: "Transaction"; Rushton, J.…

Current estimates of the contribution of education to economic growth have been questioned because they ignore the interaction of education with ability. Whether the neglect of ability differences in the analyses of the income-education relationship results in estimates which are too high is considered in this paper, using a 1964 sample of U.S.…

The book under review deals with models which identify and measure factors determining a man's educational, income, and occupational attainments. The factors include parental background, number of siblings, national origin, race, intelligence, aspirations, motivations, peer group influences, schools, the influence of wife's characteristics, first…

A topic of increasing concern to scholars and policy makers is the degree of bias in estimates of the socioeconomic returns (occupational status and earnings) to schooling. This paper, based on a re-analysis of published data from seven sources and on new data, attempts to quantify the specification bias due to the omission of socioeconomic…

To study the prevalence of mental retardation in Puerto Rico, the proportional distribution of successful retardates, and the processes accounting for success and failure, a random sample of 4,771 adults between the ages of 23 and 49 was screened by the Stanford Binet Form L and a vocabulary test. From this sample, the estimated retardation rate…