Do socioeconomic advantages accumulate as children age?
Core argument: Using NLSY79 mothers' children (N ≈ 9,000; ~27,000 observations), the analysis finds that small increases with age in socioeconomic status (SES) effects on cognitive and achievement test scores are largely explained by parental and prior abilities.
Analysis of data from NLSY79 mothers' children (N ≈ 9000, Obs ≈ 27,000) reveals that while SES [socioeconomic status] effects on cognitive and achievement domains show small increases with age, these are largely explained by parental and prior abilities. Regression analyses indicate that SES effects do not increase with age when accounting for mother's ability, suggesting that observed SES effects are spurious. Mother's ability correlates at 0.26 with digit memory and between 0.4 and 0.5 with other domains, while SES correlates at 0.62 with mother's ability. The study concludes that SES effects on children's test scores are minimal when net of parental and child's abilities, indicating no cumulative socioeconomic advantage. This suggests that the perceived impact of SES is more genetic in origin, emphasizing the role of inherited cognitive abilities over environmental factors in educational outcomes.











Ed Comment:Here’s the problem with this study: a shocking 66% of the children were Asian while 95% of the parents were white. Which white parents are eager to adopt Asian children? …the smart ones that really want smart children. so this study is likely to find more relation with parents IQ then actually exists but for selection bias.
Note their takeaway on twin studies, "...A long history of twin and family studies has found that between 50 and 80% of variance in IQ is associated with genetic factors in industrialized countries, with perhaps 50% attributable to additive genetic factors alone..."