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61.
Phenotyping the system of prejudice and discrimination, which gives preference to European physical characteristics and devalues those of Amerindians, Africans, and Asians, affects the lives of many Latinos in the United States. This study examines the impact of phenotyping on academic and employment outcomes among Latino adolescents/young adults. Outcomes examined include the odds of graduating from high school, finding full-time employment after completing high school, and attending college. Socioeconomic status (measured at individual and school levels), family structure, quality of parent–child relationships, immigrant generational status, and other measures are included as controls. Multilevel modeling and logistic regression are utilized as analytical tools. Results indicate that, among Latinos, light skin and blue eyes are associated with better academic outcomes than having dark skin and brown eyes, while those with darker skin enter the labor market earlier than their light-skinned co-ethnics. 相似文献
62.
Due to persistent and serious threats from natural disasters around the globe, many have turned to resilience and vulnerability research to guide disaster preparation, recovery, and adaptation decisions. In response, scholars and practitioners have put forth a variety of disaster indices, based on quantifiable metrics, to gauge levels of resilience and vulnerability. However, few indices are empirically validated using observed disaster impacts and, as a result, it is often unclear which index should be preferred for each decision at hand. Thus, we compare and empirically validate five of the top U.S. disaster indices, including three resilience indices and two vulnerability indices. We use observed disaster losses, fatalities, and disaster declarations from the southeastern United States to empirically validate each index. We find that disaster indices, though thoughtfully substantiated by literature and theoretically persuasive, are not all created equal. While four of the five indices perform as predicted in explaining damages, only three explain fatalities and only two explain disaster declarations as expected by theory. These results highlight the need for disaster indices to clearly state index objectives and structure underlying metrics to support validation of the results based on these goals. Further, policymakers should use index results carefully when developing regional policy or investing in resilience and vulnerability improvement projects. 相似文献
63.
The aim of this paper is to introduce new statistical criteria for estimation, suitable for inference in models with common continuous support. This proposal is in the direct line of a renewed interest for divergence based inference tools imbedding the most classical ones, such as maximum likelihood, Chi-square or Kullback–Leibler. General pseudodistances with decomposable structure are considered, they allowing defining minimum pseudodistance estimators, without using nonparametric density estimators. A special class of pseudodistances indexed by α>0, leading for α↓0 to the Kullback–Leibler divergence, is presented in detail. Corresponding estimation criteria are developed and asymptotic properties are studied. The estimation method is then extended to regression models. Finally, some examples based on Monte Carlo simulations are discussed. 相似文献
64.
Matthew D. Wood Kenton Plourde Sabrina Larkin Peter P. Egeghy Antony J. Williams Valerie Zemba Igor Linkov Daniel A. Vallero 《Risk analysis》2020,40(1):83-96
The volume and variety of manufactured chemicals is increasing, although little is known about the risks associated with the frequency and extent of human exposure to most chemicals. The EPA and the recent signing of the Lautenberg Act have both signaled the need for high-throughput methods to characterize and screen chemicals based on exposure potential, such that more comprehensive toxicity research can be informed. Prior work of Mitchell et al. using multicriteria decision analysis tools to prioritize chemicals for further research is enhanced here, resulting in a high-level chemical prioritization tool for risk-based screening. Reliable exposure information is a key gap in currently available engineering analytics to support predictive environmental and health risk assessments. An elicitation with 32 experts informed relative prioritization of risks from chemical properties and human use factors, and the values for each chemical associated with each metric were approximated with data from EPA's CP_CAT database. Three different versions of the model were evaluated using distinct weight profiles, resulting in three different ranked chemical prioritizations with only a small degree of variation across weight profiles. Future work will aim to include greater input from human factors experts and better define qualitative metrics. 相似文献
65.
Antonio Casado da Rocha Igor Calzada 《Innovation: The European Journal of Social Science Research》2015,28(4):425-442
This article presents a framework informed by two disciplines, Social Innovation and Applied Ethics, to be used in an ongoing analysis of territorial democratic systems. It aims to combine Social Innovation and Applied Ethics analysis to better understand the socio-political regeneration process in Iceland initiated with the 2008 global crisis. This crisis, particularly in Iceland had an economic and political aspect affecting the self-understanding of the territories as a whole, but in the Basque Country at present, it also deals with the current peace process to settle down political violence and its causes. In both cases there are deep underlying value issues. Nevertheless, this article introduces only the results obtained in Iceland. While its democratic system has proven to be able to contest the causes of the crisis, there is no definitive evidence that the re-examination process that was opened in October 2008 is resolved yet. 相似文献
66.
67.
Igor Litvinchev Socorro Rangel Jania Saucedo 《Journal of Combinatorial Optimization》2010,19(3):241-257
A simple procedure to tighten the Lagrangian bounds is proposed. The approach is interpreted in two ways. First, it can be
seen as a reformulation of the original problem aimed to split the resulting Lagrangian problem into two subproblems. Second,
it can be considered as a search for a tighter estimation of the penalty term arising in the Lagrangian problem. The new bounds
are illustrated by a small example and studied numerically for a class of the generalized assignment problems. 相似文献
68.
69.
Antonio Lijoi Igor Prünster Stephen G. Walker 《Australian & New Zealand Journal of Statistics》2007,49(3):209-219
Rates of convergence of Bayesian nonparametric procedures are expressed as the maximum between two rates: one is determined via suitable measures of concentration of the prior around the “true” density f0, and the other is related to the way the mass is spread outside a neighborhood of f0. Here we provide a lower bound for the former in terms of the usual notion of prior concentration and in terms of an alternative definition of prior concentration. Moreover, we determine the latter for two important classes of priors: the infinite–dimensional exponential family, and the Pólya trees. 相似文献
70.
Mikhail Kovtun Igor Akushevich Kenneth G. Manton H. Dennis Tolley 《Statistical Methodology》2007,4(1):90-110
A new method for analyzing high-dimensional categorical data, Linear Latent Structure (LLS) analysis, is presented. LLS models belong to the family of latent structure models, which are mixture distribution models constrained to satisfy the local independence assumption. LLS analysis explicitly considers a family of mixed distributions as a linear space, and LLS models are obtained by imposing linear constraints on the mixing distribution.LLS models are identifiable under modest conditions and are consistently estimable. A remarkable feature of LLS analysis is the existence of a high-performance numerical algorithm, which reduces parameter estimation to a sequence of linear algebra problems. Simulation experiments with a prototype of the algorithm demonstrated a good quality of restoration of model parameters. 相似文献