منابع مشابه
Selective limitation of sibship size.
The belief that a morbid condition is attributable to their genes may lead parents to limit the size of the sibship in two ways. If the belief precedes the birth of an affected individual (A), the parents may decline to take the risk of producing another. We may then say that the criterion of termination is A = 1. If they have no such preconception, the birth of a second affected sib may lead t...
متن کاملSibship size and education in South Africa: Black–White variations
Recent studies suggest that the generally observed negative sibship size effect on education is much less consistent in developing nations. Using data from a national survey in the early 1990s, this study assesses the effect of number of siblings on education in South Africa for two major population groups with distinctive cultural customs, Whites and Blacks. A negative effect exists for Whites...
متن کاملSibship Size and Gendered Resource Dilution in Different Societal Contexts
Resource dilution theory hypothesizes that children's educational attainment suffers from being raised with many siblings, as the parental resources have to be shared with more children. Based on economic and cultural theories, we hypothesize that resource dilution is gendered: especially a larger number of brothers is harmful to a person's educational attainment. Using the Survey of Health, Ag...
متن کاملParental Resources, Sibship Size, and Educational Performance in 20 Countries
We study whether having several siblings decreases the level of educational performance of adolescents and whether this phenomenon can be compensated by other factors such as the economic or cultural resources of the parents. Based on this compensation model, parental resources should be associated with children's educational attainments more strongly in families with a higher rather than a low...
متن کاملSpatial limitation of vertical-size disparity processing
We investigated the upper limit of horizontal spatial modulation of vertical-size disparity in a textured surface for the perception of depth. In Experiment 1 subjects matched the appearance of a surface with modulated horizontal-size disparity to that of a surface with modulated vertical-size disparity. In Experiment 2 we determined the threshold amplitude of modulation of vertical-size dispar...
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ژورنال
عنوان ژورنال: Journal of Epidemiology & Community Health
سال: 1952
ISSN: 0143-005X
DOI: 10.1136/jech.6.3.188