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991.
Research into press reporting on young people has tended to concentrate on young people as offenders. In contrast, this article focuses on press coverage of teenagers as victims. Reports in two Swedish newspapers (a morning broadsheet and an evening tabloid) were studied over a period of four months and subjected to a qualitative analysis of discourse on teenagers as victims of various forms of violence and ill‐treatment. It was found that danger and threats to the teenagers were seen as gendered, and as emanating from their own age group and from outside the home and family. The class background of the victims was not salient and child welfare issues were seldom mentioned. Copyright © 2006 The Author(s). Journal compilation © National Children's Bureau. 相似文献
992.
提出一种基于图像的距下关节信息提取方法.采用最大类间方差法与交互式数学形态学方法相结合的手段从活体后足CT序列图像中分割出距骨和跟骨,以移动立方体法重建距下关节复合体的表面并以动画方式显示距骨和跟骨的结构信息,提出力矩主轴法计算距骨和跟骨相对于参考系的旋转方向及它们之间的夹角.与其他方法相比较和仿真模型论证的结果表明,基于图像的距下关节信息提取方法具有较高的准确性和精度. 相似文献
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996.
Jörg Breitung 《Statistical Papers》1997,38(3):253-269
For aggregated time series unit root tests are routinely applied to choose among trend and difference stationary models. Recent
work demonstrates that such test can also be applied for testing panel data. However, it is well known that disaggregated
data often exhibit a considerable amount of heterogeneity so that standard tests may perform poorly. To account for the heterogeneity
in the data we allow for individual specific deterministics, that is, we let the time trends vary across the cross section
units. It is shown that standard GMM estimators suggested for the dynamic panel data model may fail to give a valid test procedure.
To overcome this difficulty, a modified GMM estimator is suggested. In a Monte Carlo study the finite sample properties of
the alternative tests are compared. 相似文献
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999.
Perception of Job Instability in Europe 总被引:1,自引:0,他引:1
The perception of job instability is an important measure of subjective well being of individuals, because most people derive
their income from selling their labour services. The study explores the determination of perception of job instability in
Europe. The study is based on a large-scale survey from the year 1998. There are evidently large differences in the amount
of perceived job instability from country to country. The lowest level of perceived job instability is in Denmark (9%). In
contrast, the highest level of perceived job instability is in Spain (63%). Perceived job instability increases with age and
an earlier unemployment episode. An increase in educational level, on the other hand, leads to a decline in the perception
of job instability. In addition, a temporary contract as such does not yield an additional increase to the perception of job
instability. The perception of job instability is more common within manufacturing industries and there is some evidence for
the view that it increases according to the size of the firm. 相似文献
1000.
U. Küsters 《Statistical Papers》1990,31(1):131-145
A marginal and sequential maximum likelihood estimation method is described which can be used instead of full information
maximum likelihood estimation if the latter method is unfeasible. It is shown that the sequential procedure yields strongly
consistent and asymptotically normal estimates under relatively general regularity conditions. It is shown that the covariance
matrix of the sequential ML estimator does not coincide with the inverse of the Fisher information matrix. Hence, the corrected
covariance matrix is derived. The application of the sequential procedure to the multivariate probit model with dichotomous,
ordered categorical, single-sided censored and double-sided censored endogenous variables is included.
This research was partially supported by a dissertation grant of theStudienstiftung des Deutschen Volkes. Comments and suggestions on earlier drafts by Gerhard Arminger, Giorgio Calzolari, Bernd Kortzen and an anonymous referee
are gratefully acknowledged. 相似文献