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排序方式: 共有211条查询结果,搜索用时 31 毫秒
111.
Trends in educational assortative marriage from 1940 to 2003 总被引:3,自引:0,他引:3
This paper reports trends in educational assortative marriage from 1940 to 2003 in the United States. Analyses of census and Current Population Survey data show that educational homogamy decreased from 1940 to 1960 but increased from 1960 to 2003. From 1960 to the early 1970s, increases in educational homogamy were generated by decreasing intermarriage among groups of relatively well-educated persons. College graduates, in particular; were increasingly likely to marry each other rather than those with less education. Beginning in the early 1970s, however; continued increases in the odds of educational homogamy were generated by decreases in intermarriage at both ends of the education distribution. Most striking is the decline in the odds that those with very low levels of education marry up. Intermarriage between college graduates and those with "some college" continued to decline but at a more gradual pace. As intermarriage declined at the extremes of the education distribution, intermarriage among those in the middle portion of the distribution increased. These trends, which are similar for a broad cross section of married couples and for newlyweds, are consistent with a growing social divide between those with very low levels of education and those with more education in the United States. 相似文献
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113.
Jacob Schwartz 《统计学通讯:理论与方法》2013,42(2):465-478
Using the techniques developed by Subrahmaniam and Ching’anda (1978), we study the robustness to nonnormality of the linear discriminant functions. It is seen that the LDF procedure is quite robust against the likelihood ratio rule. The latter yields in all cases much smaller overall error rates; however, the disparity between the error rates of the LDF and LR procedures is not large enough to warrant the recommendation to use the more complicated LR procedure. 相似文献
114.
Schwartz AJ 《Journal of American college health : J of ACH》2006,54(6):327-337
Are clients at college counseling centers more disturbed today than they were 5, 10, or 20 years ago? Since the mid-1980s, counseling center personnel have consistently perceived student clients as more distressed or reported acutely distressed clients as more prevalent than they did 1, 3, or 5 years ago. Only 3 studies employing a systematic, data-based methodology have addressed this question. Two researchers used different actuarial measures of the acuity or character of client pathology and concluded that current student clients are not more disturbed than were earlier ones. One researcher used clinical judgments rendered at the end of therapy and concluded that current students were more distressed. Using the Personality Assessment Inventory, the author found the actuarially determined quantitative and qualitative indices of pathology unchanged for 3,400 counseling center clients seen during 10 consecutive years. Over the same period, the use of medications increased fivefold. An actuarial measure of client distress appears crucial to both accurate diagnosis and treatment and to the adequate preparation of future counseling center professionals. 相似文献
115.
Sample size recalculation (SSR) methods ensure that a study closely achieves the required power by allowing for the original sample size to be modified through updating misspecified nuisance parameters. Some SSR procedures extend this concept by incorporating information on the estimated treatment difference as well. While group sequential methodology allows for early stopping of a study in the context of repeated hypothesis tests, SSR usually involves the extension of a study to accommodate misspecified design parameters. This work describes these methods and places them in a common framework. Copyright © 2003 John Wiley & Sons, Ltd. 相似文献
116.
Landsbergis PA Schnall PL Belkić KL Baker D Schwartz J Pickering TG 《Work (Reading, Mass.)》2001,17(3):191-208
Over the past 20 years, an extensive body of research evidence has documented that psychosocial work stressors are risk factors for hypertension and cardiovascular disease. These stressors, which appear to be increasing in prevalence, include job strain (the combination of psychological job demands and low job control), imbalance between job efforts and rewards, threat-avoidant vigilant work, and long work hours. This article reviews the evidence linking these stressors with hypertension and CVD, and the physiological and social psychological mechanisms underlying the associations. Also described are methods for measuring work stressors and new, more accurate techniques for measuring blood pressure. Finally, strategies for reducing work stressors and preventing hypertension and CVD are reviewed. These include clinical assessment, worksite health promotion, work organization interventions, legal approaches and work site surveillance. 相似文献
117.
Jack Kevorkian criticizes the Hippocratic tradition in Greek medicine, which bans the physician from giving his patient a lethal medication. He sees this prohibition as potentially bringing harm to a suffering patient and not reflective of the larger Greek society which was tolerant and even approving of suicide. However, Kevorkian's advocacy of doctor-assisted suicide can be seen as the polarity of doctor abandonment of the suffering patient rather than as an antidote to it. Both positions involve an outcome of physician removal from the suffering patient, which can be contrasted with Maimonides' command to the physician to watch over the life and death of his patients. 相似文献
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119.
In an effort to promote evidence-based practice, government officials, researchers, and program developers have developed lists of model programs in the prevention field. This article reviews the evidence used by seven best-practice lists to select five model prevention programs. The authors' examination of this research raises questions about the process used to identify and publicize programs as successful. They found limited evidence showing substantial impact on drug use behavior at posttest, with very few studies showing substantial impact at longer follow-ups. The authors advocate additional long-term follow-up studies and conclude by suggesting changes in the procedures for developing best-practice lists. 相似文献
120.
Schwartz A 《Child welfare》2008,87(2):77-97
Attempts to address racial disproportionality in child welfare must include a focus on the benefits and challenges facing children in kinship care. African American children not only are overrepresented in the child welfare system, but also are placed disproportionately in kinship foster care. Using a sample of 18 African American adolescents ages 11 to 14, this article explores how the relational context of care experienced by adolescents in kinship foster care differs from that of adolescents in nonkinship foster family placements. Findings are presented regarding the stability of relationships as well as complex role dilemmas experienced by kinship youth as they relate to caregivers and birthparents in the child welfare context. Implications are given for practice with kinship families. 相似文献