jean yeung - Academia.edu (original) (raw)

Papers by jean yeung

New Directions for Child and Adolescent Development, 1996

Using data on annual patterns of family structure and other demographic and e w m u conditions th... more Using data on annual patterns of family structure and other demographic and e w m u conditions throughout childhood, this chapter analyzes the relationship between developmental stage-speciju childhood events and the timing oj independence from the parental household

New directions for child development, 1996

$Research paper thumbnail of How Money Matters for Young Children\u27s Development: Parental Investment and Family Processes$

This study used data from the Panel Study of Income Dynamics and its 1997 Child Development Suppl... more This study used data from the Panel Study of Income Dynamics and its 1997 Child Development Supplement to examine how family income matters for young children\u27s development. The sample included 753 children who were between ages 3 and 5 years in 1997. Two sets of mediating factors were examined that reflect two dominating views in the literature: (1) the investment perspective, and (2) the family process perspective. The study examined how two measures of income (stability and level) were associated with preschool children\u27s developmental outcomes (Woodcock-Johnson [W-J] Achievement Test scores and the Behavior Problem Index [BPI]) through investment and family process pathways. Results supported the hypothesis that distinct mediating mechanisms operate on the association between income and different child outcomes. Much of the association between income and children\u27s W-J scores was mediated by the family\u27s ability to invest in providing a stimulating learning environme...

The ANNALS of the American Academy of Political and Social Science, 2018

This article summarizes important contributions of the Child Development Supplement to the PSID (... more This article summarizes important contributions of the Child Development Supplement to the PSID (PSID-CDS) to knowledge in child development, time use, media use, and health. The PSID-CDS began in 1997, surveying 2,394 households, including 3,563 children; three waves of data on the first cohort were collected—1997, 2002–03, and 2007–08—and a new cohort was interviewed in 2014. Hundreds of books, journal articles, and dissertations have used the PSID-CDS, and our overview of that literature points to unique methodological and measurement contributions, summarizes the motivation for research on parental investments in children, reviews findings regarding healthy child development, and examines the role of neighborhoods in children’s lives.

The Gas Situation in the ECE Region Around the Year 1990, 1979

Based on two waves of panel data for three age cohorts of children from the Panel Study of Income... more Based on two waves of panel data for three age cohorts of children from the Panel Study of Income Dynamics Child Development Supplements, we find large black-white test score differences among children of all ages. Even before children start formal schooling, black children score .8 and .5 of a standard deviation lower than whites in Applied Problem and Letter-Word tests respectively. Except for the oldest cohort, the gaps for all tests widened when children's cognitive skills were assessed again six years later. All achievement gaps before grade three can be accounted for when we control for the child's characteristics, home environment (both structural and cultural factors), and a proxy for mother's cognitive skills. As children advance to higher grades, there is a diminishing role of these covariates in explaining the achievement gap. In preschool years, the gaps are reduced to less than .2 of a standard deviation when all covariates are controlled for. In the first three years of school, the gaps are reduced to about .3 of a standard deviation, whereas in high school years, the gaps remain a statistically significant .5 and .65 of a standard deviation for Applied Problem and Letter-Word scores respectively after all the covariates are controlled for (representing 63% and 88% of the raw test score gap). Overall, family SES characteristics are important contributors to the gap between the test scores although the set of significant family characteristics varies across cohorts and across different tests. We also find that gender differences in Applied Problem scores start to emerge as soon as children enter formal schooling and remain prominent in middle and high school years, and that black boys lose more ground to their white counterparts than black girls.

Journal of Population Economics, 2001

This paper examines a wide variety of forms, and full histories, of family structure to test exis... more This paper examines a wide variety of forms, and full histories, of family structure to test existing theories of family in¯uences and identify needs for new theories. The focus is on links between childhood family structure and both completed schooling and risk of a nonmarital birth. Using a 27-year span of panel (PSID) data for U.S. children, we ®nd that: (a) change is stressful, (b) timing during childhood is relevant, (c) adults other than parents are important, and (d) two more recently studied family structures (motherwith-grandparent(s) and mother-with-stepfather) do not ®t the molds of existing theories. The ®ndings suggest that new theories should consider allocation of resources and reasons people group into family structures.

Quality of Life in Asia, 2013

10.1007/978-94-007-7386-8Economic Stress, Human Capital, and Families in Asia : Research and Poli... more 10.1007/978-94-007-7386-8Economic Stress, Human Capital, and Families in Asia : Research and Policy Challenges1-2

China's oldest-old population is estimated to quadruple by 2050. Yet, poverty rate for the oldest... more China's oldest-old population is estimated to quadruple by 2050. Yet, poverty rate for the oldestold is the highest among all age groups in China. This paper investigates the relationship between economic stress and mortality among the oldest-old in China. Both objective economic hardships and perceived economic strain are examined. We base our investigation on data drawn from the Chinese Longitudinal Healthy Longevity Survey conducted between 2000 and 2005. We find that economic stress is negatively associated with the quality of medical care and mental well-being which contribute to the higher mortality rate for the oldest-old. Results also show that the perceived economic strain increases the mortality risk by 40 percent in rural area but not in urban area. For rural oldest-olds, having children as a main source of income and having pension alleviate the impact of economic hardship and reduce the mortality hazard by 23 percent and 66 percent respectively.

Access to the most relevant and current information is critical to financial analysis and decisio... more Access to the most relevant and current information is critical to financial analysis and decision making. Historically, financial news has been discovered through company press releases, required disclosures and news articles. More recently, social media has reshaped the financial news landscape, radically changing the dynamics of news dissemination. In this paper we discuss the ways in which Twitter, a leading social media platform, has contributed to changes in this landscape. We explain why today Twitter is a valuable source of material financial information and describe opportunities and challenges in using this novel news source for financial information discovery.

APA educational psychology handbook, Vol 2: Individual differences and cultural and contextual factors., 2012

ABSTRACT

Chinese Social Policy in a Time of Transition, 2013

La vision omnidirectionnelle : introduction, modèle de projection etétalonnage 1. La vision omnid... more La vision omnidirectionnelle : introduction, modèle de projection etétalonnage 1. La vision omnidirectionnelle : introduction, modèle de projection etétalonnage 1. La vision omnidirectionnelle : introduction, modèle de projection etétalonnage 2 Estimation du mouvementà partir d'une caméra centrale catadioptrique 2.1 Représentation minimale De nombreuses transformations (rotations, homographies) et objets géométriques (plans, droites 3D) utilisés en vision par ordinateur et en robotique peuventêtre paramétrés en utilisant des groupes de Lie dont une représentation minimale-au moins locale-existe. Ces paramétrisations permettent de s'assurer que dans des problèmes de minimisation les objets manipulés restent dans les groupesétudiés. Le Chapitre 5 résument certaines propriétés des algèbres de Lie et des matrices exponentielles. Un point important est la représentation de ces entités dans les problèmes d'optimisations. Soit G un groupe de Lie matriciel de dimension n, soit : f : G −→ R g −→ f (g) Considérons le problème de minimisation suivant, avec d une distance différentiable (typiquement une norme L 2) et f ∈ R : g = min g d(f (g), f) Si f est une fonction non-linéaire, le problème n'a souvent pas de solution explicite et une méthode de descente de gradient est couramment employée. Nous partons d'une solution initiale de valeur g età chaqueétapes nous rajoutons une valeur g k calculéeà partir du jacobien, par exemple : g ← g+g k. Le problème d'une telle approche est que nous ne pouvons garantir que la nouvelle valeur g va appartenir au groupe G. Pour résoudre ce problème, la nouvelle valeur g est souvent projetée sur la variété mais ceci peu dégraderà la fois la vitesse mais aussi la région de convergence. Une alternative est de définir une nouvelle fonction h. Avec g l'algèbre de Lie de G et + l'opération de groupe. h : R n −→ g −→ R x −→ G(x) −→ f (g + e G(x)) h est seulement défini localement par la paramétrisation de l'algèbre de Lie de G. Si nous appliquons une méthode de descente de gradientà h en partant de x = 0 (qui correspondà la valeur initiale f), la miseà jour s'écrit : g ← g + e G(x k). Nous sommes maintenant assurés qu'à chaqueétape la nouvelle valeur de g appartient au groupe de Lie G. Notons qu'il faut aussi s'assurer qu'il existe un chemin reliant gà g (voir Chapitre 5). cartographie. Les exemples de cartographie ont aussi permis de mettre en avant l'avantage des capteurs omnidirectionnels notamment pour la reconnaissance de lieux et la fermeture de boucle, deux problèmes importants du SLAM. Ces travaux ouvrent des perspectives dans le domaine de la reconstruction 3D temps-réel soit avec la vision seule soit en combinant vision et laser. La précision et la robustesse des méthodes proposées permettent d'envisager la cartographie dans des environnements complexes et de grandes tailles.