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AI 根据所提供的论文材料归类:摘要明确研究电视观看的动态处理效应,并采用儿童纵向数据及动态面板处理个体异质性、内生性与反馈。

反馈分类问题

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代码、数据与补充材料

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关注这篇论文的作者
Fali Huang
Myoung‐Jae Lee

电视观看对儿童认知发展的动态处理效应分析

研究问题
六至七岁及八至九岁的电视观看如何影响后期数学与阅读成绩,且如何处理认知发展反过来影响未来观看的反馈?
方法与思路
作者用 NLSY79 儿童纵向数据估计动态面板,处理个体因素和观看内生性,并提出应对双向反馈的两阶段方法。
材料陈述的贡献
摘要称数学总效应为负且主要来自较早观看;阅读效应在每日不超过两小时范围内为正、范围外为负,但经济量级较小。
阅读关注点
应核对动态反馈下的识别与工具条件、两阶段估计的目标效应,以及观看时长非线性和总效应分解的依据。
阅读边界
仅据所给 Crossref 版本摘要,动态面板并不自动保证因果识别;工具有效性、结果精度和外推范围未说明。

原文摘要

Abstract We investigate whether TV watching at ages 6–7 and 8–9 affects cognitive development measured by math and reading scores at ages 8–9, using a rich childhood longitudinal sample from NLSY79. Dynamic panel data models are estimated to handle the unobserved child‐specific factor, endogeneity of TV watching, and dynamic nature of the causal relation . A special emphasis is placed on the last aspect, where TV watching affects cognitive development, which in turn affects future TV watching. When this feedback occurs, it is not straightforward to identify and estimate the TV effect. We develop a two‐stage estimation method which can deal with the feedback feature; we also apply the ‘standard’ econometric panel data approaches. Overall, for math score at ages 8–9, we find that watching TV during ages 6–7 and 8–9 has a negative total effect, mostly due to a large negative effect of TV watching at the younger ages 6–7. For reading score, there is evidence that watching no more than 2 hours of TV per day has a positive effect, whereas the effect is negative outside this range. In both cases, however, the effect magnitudes are economically small. Copyright © 2010 John Wiley & Sons, Ltd.

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