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971.
972.
Amori Yee Mikami Erik A. Ruzek Christopher A. Hafen Anne Gregory Joseph P. Allen 《Journal of youth and adolescence》2017,46(11):2341-2354
Secondary school is a vulnerable time where stagnation or declines in classroom behavioral engagement occur for many students, and peer relationships take on a heightened significance. We examined the implications of adolescents’ perceptions of relatedness with classroom peers for their academic learning. Participants were 1084 adolescents (53% female) in 65 middle and high school classrooms. Multilevel cross-lagged path analyses found that adolescents’ perceived relatedness with classroom peers subsequently predicted their increased self-reported behavioral engagement in that classroom from fall to winter and again from winter to spring. Higher engagement in spring predicted higher end of year objective achievement test scores after statistical control of prior year test scores. Implications are discussed for increasing classroom peer relatedness to enhance adolescents’ achievement. 相似文献
973.
Gary King Christopher Lucas Richard A. Nielsen 《American journal of political science》2017,61(2):473-489
We propose a simplified approach to matching for causal inference that simultaneously optimizes balance (similarity between the treated and control groups) and matched sample size. Existing approaches either fix the matched sample size and maximize balance or fix balance and maximize sample size, leaving analysts to settle for suboptimal solutions or attempt manual optimization by iteratively tweaking their matching method and rechecking balance. To jointly maximize balance and sample size, we introduce the matching frontier, the set of matching solutions with maximum possible balance for each sample size. Rather than iterating, researchers can choose matching solutions from the frontier for analysis in one step. We derive fast algorithms that calculate the matching frontier for several commonly used balance metrics. We demonstrate this approach with analyses of the effect of sex on judging and job training programs that show how the methods we introduce can extract new knowledge from existing data sets. 相似文献
974.
Brendan Nyhan Christopher Skovron Rocío Titiunik 《American journal of political science》2017,61(3):744-760
The widespread availability of voter files has improved the study of participation in American politics, but the lack of comprehensive data on nonregistrants creates difficult inferential issues. Most notably, observational studies that examine turnout rates among registrants often implicitly condition on registration, a posttreatment variable that can induce bias if the treatment of interest also affects the likelihood of registration. We introduce a sensitivity analysis to assess the potential bias induced by this problem, which we call differential registration bias. Our approach is most helpful for studies that estimate turnout among registrants using posttreatment registration data, but it is also valuable for studies that estimate turnout among the voting‐eligible population using secondary sources. We illustrate our approach with two studies of voting eligibility effects on subsequent turnout among young voters. In both cases, eligibility appears to decrease turnout, but these effects are found to be highly sensitive to differential registration bias. 相似文献
975.
976.
Korea's more complete integration into the world economy has been stunted by past government policies aimed at preserving comprehensive control over the domestic economy. This situation has recently changed owing to prevailing structural weaknesses in the Korean economy and the dictates of the global competitive environment. Consequently, the level of Korean overseas investment has escalated, particularly in Europe — the Triad region which has traditionally attracted limited inward FDI from Korea's large chaebol companies. This paper examines the determining forces that lie behind this trend. It is recognized that early Korean investments in the EU were principally driven by reactionary motives when confronted by actual or anticipated policy threats. While it is argued that the pretext for such investment has not significantly diminished, the imperatives of globalization together with emerging economic conditions in both east and west Europe have provided considerable incentives for more proactive FDI strategies to be adopted. The recent announcements by senior chaebol of intended large‐scale investments in Europe suggest that this new pattern is becoming increasingly apparent. 相似文献
977.
A review of previous research indicates that people's valuationsof government supplied services are not closely related to theircosts, raising the question of how much people know about thecosts of such goods. Respondents rated the value of governmentand market supplied goods and services and estimated their costsin three studies. The respondents made poor estimates of the percapita costs of supplying government services, and were littlebetter at estimating per capita expenditure on a range of marketsupplied goods (e.g., expenditure on fruit), but they were quiteaccurate at estimating the prices of individual market supplieditems. Rated values of individual market supplied itemscorrelated well with the costs of the items, but rated annualvalues of both government and market supplied goods were moreweakly correlated with their annual per capita costs. The resultssuggests that the inaccuracy in estimating the costs ofgovernment goods might arise because such items do not haveindividual item prices rather than because people generally donot pay for them themselves. 相似文献
978.
Is a trade‐off between the social benefits of regulation and the economic benefits of development inevitable? We argue that environmental regulation may deter economic growth in some contexts, however, in other contexts the benefits of regulation may be obtained with little or no economic loss. We develop an explanation of the economic impacts of state environmental policy based on a model of public influence on private resource allocation decisions. In this model, we assume utility‐maximizing firms will make investment choices based upon the projected profits on their investments and their willingness to accept the risk associated with the investments. We assert that state policies and administrative institutions influence perceptions of risk by increasing or decreasing uncertainty over future environmental policy and influence return on investments at particular locations by affecting firm‐level production costs. Our results confirm that certain administrative arrangements for environmental regulation may enhance, rather than impede, economic development. 相似文献
979.
980.
Christopher J. Fettweis Author Vitae 《Orbis》2009,53(3):507-523
Debates regarding the Bush Administration's grand strategy began long before the forty-third president left office. A group of distinguished historians and political scientists have argued over the course of the last few years that the Administration's grand strategy did not represent a major break with historical precedent, as is sometimes argued, but continued the evangelical support for liberty that has always made the United States a “dangerous nation” to tyrants. Along the way, this revisionism creates straw men, and co-opts or redefines terms that are central to the traditional understanding of U.S. foreign policy. It also seems to misunderstand grand strategy itself, focusing almost entirely on continuity of ends while ignoring the rather glaring discontinuities in the ways that generations of U.S. presidents have chosen to pursue them. Overall, the revisionist project fails in both of its tasks, which are: To make the case that the Bush administration took actions of which the Founding Fathers would have understood and approved; and by implication, to justify the unnecessary, tragic war in Iraq. 相似文献