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排序方式: 共有677条查询结果,搜索用时 31 毫秒
671.
Carolyn Turpin-Petrosino 《The Journal of social issues》2002,58(2):281-301
Sources indicate a rise in hate crimes committed by persons affiliated with hate groups (Bowles, 1993; Levin, 2002). Although the majority of these offenders remain unaffiliated, it is nevertheless important to understand why individuals become attracted to hate groups. This exploratory study examined youth attitudes toward hate groups. Deprivation and interpersonal bonds theories were used to explain hate group attraction among students. Secondary and university students completed the 567 surveys used in the analysis. Results indicated that crime-related measures and exposure to hate groups by word-of-mouth contacts were more often related to supportive attitudes. These effects were further associated with secondary students. Neodeprivation theory is offered for exploring hate group attraction by more educated persons. 相似文献
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674.
Population and land use change in the California Mojave: Natural habitat implications of alternative futures 总被引:6,自引:0,他引:6
Hunter Lori M. Gonzalez G Manuel De J. Stevenson Matt Karish Kimberly S. Toth Richard Edwards Thomas C. Lilieholm Robert J. Cablk Mary 《Population research and policy review》2003,22(4):373-397
Demographic and land use dynamics have important implications for the natural environment within both developed and developing nations. Within the context of developed nations, popular and policy debates surrounding contemporary patterns of suburbanization attest to the salience of demographic and development issues. We examine the implications of land-use patterns as related to population and development within the context of the California Mojave Desert ecosystem. In a general sense, we aim to better understand the land requirements inferred by varying levels of population growth and density, as well as the natural habitat implications of those requirements. We develop a GIS including remotely sensed imagery, and demographic, economic, and biophysical data to examine of the implications of various demographic scenarios on species diversity. Spatial and statistical models are designed to develop possible alternative land use `futures'. Within the context of the California Mojave region, our results suggest that high-density development could reduce conflict with regions providing potential habitat for threatened or endangered species by over 80 percent. The process of model development demonstrates a potentially useful tool for policymakers, allowing for estimation and visualization of the land use implications of policy decisions. 相似文献
675.
Alfred A. Hunter 《Demography》1972,9(1):107-117
Studies in factorial ecology have typically used the principal factor procedure coupled with varimax rotation. Since it can be shown that the results one obtains vary according to the factor and rotation models he employs, and since there is no one “best” way of obtaining initial and derived factor solutions, it is proposed that future research in the area adopt an approach involving the simultaneous use of several different computing algorithms for obtaining initial solutions and both orthogonal and oblique rotation procedures to avoid the possibility that the results one obtains are not method-dependent. Ideally, the factor models employed should differ maximally with respect to the principles upon which they are based. If one finds a given factor regardless of the method he uses, only then can he assert with any confidencethat it is not an artifact of his method. Factorial ecologists are often interested in computing “factor scores”, but “true” factor scores are not uniquely computable; they can only be estimated. Since the proposed research strategy involves using either a component or an image model, in which the corresponding scores are exact and uniquely computable, the factor score problem is, in a sense, solved. Next it is suggested that, by using orthogonal solutions, factorial ecologists may be overlooking a very important piece of information—the correlation between the factors. There is some reason to believe that this varies from city to city, and may account for the fact that some factors which emerge in studies of Western cities are sometimes not found in cities elsewhere. Some comments are also made on the value of using census tract data, and on the availability of computer programs for different initial and derived factor solutions. 相似文献
676.
Steven Huddart John S. Hughes Carolyn B. Levine 《Econometrica : journal of the Econometric Society》2001,69(3):665-681
Regulation requiring insiders to publicly disclose their stock trades after the fact complicates the trading decisions of informed, rent‐seeking insiders. Given this requirement, we present an insider's equilibrium trading strategy in a multiperiod rational expectations framework. Relative to Kyle (1985), price discovery is accelerated and insider profits are lower. The strategy balances immediate profits from informed trades against the reduction in future profits following trade disclosure and, hence, revelation of some of the insider's information. Our results offer a novel rationale for contrarian trading: dissimulation, a phenomenon distinct from manipulation, may underlie insiders' trading decisions. 相似文献
677.
Theories across cognitive domains propose that anticipating upcoming sensory input supports information processing. In line with this view, prior findings indicate that adults and children anticipate upcoming words during real-time language processing, via such processes as prediction and priming. However, it is unclear if anticipatory processes are strictly an outcome of prior language development or are more entwined with language learning and development. We operationalized this theoretical question as whether developmental emergence of comprehension of lexical items occurs before or concurrently with the anticipation of these lexical items. To this end, we tested infants of ages 12, 15, 18, and 24 months (N = 67) on their abilities to comprehend and anticipate familiar nouns. In an eye-tracking task, infants viewed pairs of images and heard sentences with either informative words (e.g., eat) that allowed them to anticipate an upcoming noun (e.g., cookie), or uninformative words (e.g., see). Findings indicated that infants' comprehension and anticipation abilities are closely linked over developmental time and within individuals. Importantly, we do not find evidence for lexical comprehension in the absence of lexical anticipation. Thus, anticipatory processes are present early in infants' second year, suggesting they are a part of language development rather than solely an outcome of it. 相似文献