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排序方式: 共有1147条查询结果,搜索用时 15 毫秒
961.
Berna Güroğlu Gerbert J. T. Haselager Cornelis F. M. Van Lieshout Ron H. J. Scholte 《Journal of research on adolescence》2009,19(1):35-46
This study investigated the heterogeneity of mutual antipathy relationships. Separate cluster analyses of peer interactions of early adolescents (mean age 11 years) and adolescents (mean age of 14) yielded 3 types of individuals in each age group, namely Prosocial, Antisocial, and Withdrawn. Prevalence analysis of the 6 possible combinations of types of individuals constituting mutual antipathy dyads yielded antipathy dyad types. The majority of these dyads consisted of a combination of 2 dissimilar types of individuals. Implications of the high prevalence of the Antisocial–Withdrawn antipathy dyad type are discussed. 相似文献
962.
This article proposes a dynamic perspective on immigrants’ language proficiency. Hypotheses are formulated about immigrants’ language skills at arrival and about the speed with which immigrants learn the language thereafter. It pools data from the 1980, 1990, and 2000 U.S. Censuses, and uses a synthetic cohort design to analyze the language skills of immigrants within the first 20 years after migration. Multilevel models show that higher educated immigrants arrive with better language skills and learn the language quicker. Group size has a double‐negative effect: it attracts less skilled immigrants, and it hampers language learning. These and other determinants are discussed in light of current research on immigrants’ second‐language proficiency. 相似文献
963.
Dries Faems Bart Van Looy Maddy Janssens Paul W.L. Vlaar 《Journal of Engineering and Technology Management》2012,29(4):508-527
Based on a case study of three asymmetric new venture development (ANVD) alliances, we examine the governance of transitions from exploration to exploitation. We propose that role deficiencies, technological asymmetry, and the presence of a separate venture unit at established firms constitute important initial conditions influencing value realization in ANVD alliances. We further show that role-specific investments act as more appropriate mechanisms than contractual incentives to govern transitions from exploration to exploitation. Jointly, these findings provide new insights into the impact of structural and relational governance mechanisms on value creation in interfirm relationships. 相似文献
964.
965.
Jan Johannes Sébastien Van Bellegem Anne Vanhems 《Journal of statistical planning and inference》2013
This paper considers the nonparametric regression model with an additive error that is correlated with the explanatory variables. Motivated by empirical studies in epidemiology and economics, it also supposes that valid instrumental variables are observed. However, the estimation of a nonparametric regression function by instrumental variables is an ill-posed linear inverse problem with an unknown but estimable operator. We provide a new estimator of the regression function that is based on projection onto finite dimensional spaces and that includes an iterative regularisation method (the Landweber–Fridman method). The optimal number of iterations and the convergence of the mean square error of the resulting estimator are derived under both strong and weak source conditions. A Monte Carlo exercise shows the impact of some parameters on the estimator and concludes on the reasonable finite sample performance of the new estimator. 相似文献
966.
This paper examines the consequences of specification error when transition matrices are used to analyse patterns of intergenerational
mobility. We show that classical measurement error in both the child’s and parent’s earnings can lead to biased results, with
summary mobility measures biased by as much as 20% in some cases. Furthermore our results suggest that the extent of the bias
is most severe in the tails of the distribution. Omitted conditioning variables appear to have a modest effect on transition
matrices in our model. 相似文献
967.
Little is known about the validity of group-level theories of ethnic intermarriage despite the fact that such theories are
often invoked in explaining why certain ethnic groups are “closed,” whereas others are relatively “open.” We develop a comparative
perspective by analyzing the marriage choices of 94 national-origin groups in the United States, using pooled data from the
Current Population Surveys, 1994–2006, and multilevel models in which individual and contextual determinants of intermarriage
are included simultaneously. Our analyses show large differences in endogamy across groups. After taking compositional effects
into account, we find that both structural and cultural group-level factors have significant effects on endogamy. Cultural
explanations (which focus on the role of norms and preferences) play a more important role than structural explanations (which
focus on meeting and mating opportunities). Our results reinforce the common but untested interpretation of endogamy in terms
of group boundaries. 相似文献
968.
Consider the nonparametric location-scale regression model Y=m(X)+σ(X)ε, where the error ε is independent of the covariate X, and m and σ are smooth but unknown functions. The pair (X,Y) is allowed to be subject to selection bias. We construct tests for the hypothesis that m(·) belongs to some parametric family of regression functions. The proposed tests compare the nonparametric maximum likelihood estimator (NPMLE) based on the residuals obtained under the assumed parametric model, with the NPMLE based on the residuals obtained without using the parametric model assumption. The asymptotic distribution of the test statistics is obtained. A bootstrap procedure is proposed to approximate the critical values of the tests. Finally, the finite sample performance of the proposed tests is studied in a simulation study, and the developed tests are applied on environmental data. 相似文献
969.
Prior research seeking to explain variation in extended family coresidence focused heavily on the potentially competing roles
of cultural preferences and socioeconomic and demographic structural constraints. We focus on challenges associated with international
immigration as an additional factor driving variation across groups. Using 2000 census data from Mexico and the United States,
we compare the prevalence and age patterns of various types of extended family and non-kin living arrangements among Mexican-origin
immigrants and nonimmigrants on both sides of the U.S.-Mexico border. Additionally, we use the Survey of Income and Program
Participation to examine the stability of extended family living arrangements among Mexican-origin immigrants and natives
in the United States. We find that newly arrived immigrants to the United States display unique patterns in the composition
and stability of their households relative to nonimmigrants in both Mexico and the United States. Recent immigrants are more
likely to reside in an extended family or non-kin household, and among those living with relatives, recent immigrants are
more likely to live with extended family from a similar generation (such as siblings and cousins). Further, these households
experience high levels of turnover. The results suggest that the high levels of coresidence observed among recently arrived
Mexican immigrants represent a departure from “traditional” household/family structures in Mexico and are related to the challenges
associated with international migration. 相似文献
970.
Marieke Louis 《Globalizations》2017,14(4):535-549
Representativeness has become a keyword in reform projects of global governance. While it often appears as a cure for the legitimacy deficit of international organizations, this notion has hardly been defined at the global level. This article aims at filling this void by providing a socio-historical account of the meanings and uses of this concept based on a comparison of the International Labor Organization (ILO) and the International Organization for Standardization (ISO), two of the oldest organizations in the global arena. Looking at the genesis of both organizations, the article shows that the categories and mechanisms used by international organizations to select their members are embedded in a broader socio-historical, political, and economic context. Moreover, they are subject to contestation and transformation. Representativeness may therefore be used both as a political resource for international players and as an analytical category for the study of the multilateral system over time. 相似文献