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A sample size justification should be given for all clinical investigations. However, sometimes the objective of a trial is to estimate an effect with a view to planning a later definitive study. This paper describes the calculations for designing studies where one wishes to adopt an estimation approach through using confidence intervals around the overall response. Calculations are given for data anticipated to take a Normal form. Copyright © 2004 John Wiley & Sons, Ltd. 相似文献
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Scott M. Cutlip 《Public Relations Review》1991,17(4)
When the public relations firm D-A-Y was dissolved into Ogilvy & Mather Public Relations November 1, 1988, the longest lived public relations agency disappeared into the sands of time that enveloped the first four agencies started in the first decade of the waning century. The D in D-A-Y stood for Pendleton Dudley, a venerable pioneer in this vocation, who had opened his agency in Wall Street in 1909 at the urging of his good friend, Ivy Lee. Dudley, a rugged, independent product of frontier America, headed his firm for fifty-seven years—a longevity record surpassed only by that of Edward L. Bernays, who started his firm in 1919 in the Post World War I public relations boom.Pendleton Dudley—known to his close friends as Pen and to his associates in his firm as PD, was born September 8, 1876, in a small frontier town of Troy, Missouri, when America was an agricultural nation. He came to pioneer as a counselor to the corporate giants, AT&T among them, in a complex, interdependent corporate industrial America. Pen Dudley did much to infuse this field with respectability in a time when it was viewed with suspicion or disdain in its early years. He was a strong advocate of research as the only sound basis for planning and executing programs to influence public behavior. He was also active in the Public Relations Society of America after it was formed in 1948 and was in the forefront of those creating the now extinct Foundation for Public Relations Research and Education. In 1965, he received the Distinguished Service Award from the New York PRSA Chapter. He died at the age of 90 in 1966.The author is Dean Emeritus of Journalism at the University of Georgia, and co-author Effective Public Relations, 6th Ed. 相似文献
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Scott Schieman 《The Sociological quarterly》2002,43(4):627-646
Using data from a representative sample of adults age eighteen to fifty‐five who reside in Toronto, Canada, and are employed in the paid labor force, this study asks: Are the health benefits of education, income, job autonomy, and nonroutinized work different for women and men? If so, do mastery and self‐esteem contribute to those differences? Results show that women and men derive different personal benefits from socioeconomic status and job qualities: (1) education, job autonomy, and nonroutinized work are associated more positively with the sense of mastery among women, (2) job autonomy is associated more positively with self‐esteem among women, (3) education, job autonomy, and nonroutinized work are associated more negatively with depressive symptoms among women, and (4) job autonomy and nonroutinized work are associated more positively with global health among women. Moreover, the patterns in (1) and (2) explain the gender‐contingent effects in (3) and (4). In addition, unexpected suppression effects reveal that, among men, education is associated negatively with mastery and self‐esteem—but only after adjustment for job conditions. I interpret the findings in the context of the disadvantaged status thesis and speculate about status‐related social comparison processes. 相似文献
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V. Scott H. Solberg Aaron H. Carlstrom Kimberly A. S. Howard Janice E. Jones 《The Career development quarterly》2007,55(4):313-327
Using cluster analysis, 789 predominately Latino and African American high school youth were classified into varying academic at‐risk profiles using self‐reported levels of academic confidence, motivation to attend school, perceived family support, connections with teachers and peers, and exposure to violence. Six clusters emerged, 5 of which were identified as “at‐risk.” The clusters were examined in relation to academic stress, health status, grades, and school retention. Exposure to violence was one distinguishing feature of youth identified as most vulnerable, vulnerable, and resilient; however, youth identified as resilient recorded better academic outcomes. 相似文献
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Regina Thompson Paul H. Templet John K. Gamman Scott T. McCleary Margaret A. Reams 《Risk analysis》1994,14(5):857-861
The goal of Louisiana's 1990–1991 comparative risk project, also called the Louisiana Environmental Action Plan (LEAP), was to incorporate risk assessment into state environmental planning and policymaking. Scientists, government officials, and citizens were brought together to estimate the relative risk to human health, natural resources, and quality of life posed by 33 selected environmental issues. The issues were then ranked according to their relative estimated risks. It was hoped that this ranking of "comparative risks" would enable state policymakers to target the most important environmental problems and allocate scarce public resources more rationally and efficiently. As a result of the project, the governor issued an Executive Order forming a permanent Public Advisory Committee to continue this type of comparative risk assessment in Louisiana. 相似文献
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Dorothy Scott 《The Australian journal of social issues》1995,30(1):71-94
Recent media coverage of child abuse in Victoria is critically analysed. Parallels are drawn between the substance and style of newspaper coverage of child abuse cases in the late nineteenth century ‘first wave’ of the child rescue movement and that in the late twentieth century ‘second wave’ of the child rescue movement. The twin themes of vengeance and voyeurism are clearly evident in both periods. The classic late nineteenth century concepts of Freud and Durkheim are drawn upon to illuminate the psychological and sociological sources of these themes. The current Victorian child protection system is used as a case study to explore the paradoxes for policy and practice which arise in part from the publicisation and associated politicisation of child abuse. These paradoxes include the redirection of resources from prevention and treatment to investigation services. 相似文献
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A fact-gathering, experimental game proved to be an effective instrument in the needs assessment phase of an adolescent sexuality educational program aimed at low-income females. The game ("Family Few"), which covered the topics of menstruation and reproduction, was played by 35 Black, Hispanic, and white females aged 13-16 years recruited from medical and psychiatric clinics in Miami, Florida. The goals of the game were to elicit terminology used by participants, identify and correct misconceptions and misinformation, and determine if learning could occur. Although 57% of participants reported prior exposure to formal sex education, misinformation about the need for activity curtailment during menstruation and the importance of early pregnancy detection was widespread. Group members believed they needed to restrict activities involving physical exercise, sexual relations, water, and cold during menses and were not likely to seek medical or family consultation regarding a missed period until the end of the 1st trimester of pregnancy. Also evident was a need for accurate information on the side effects, risk factors, benefits, and effectiveness of contraceptive methods. The group responses enabled the sex educators to prepare a culturally responsive, developmentally oriented curriculum for further work with disadvantaged female adolescents. The group process was ranked highly on the Likert Scale by these teenagers as an enjoyable, useful means of information dissemination and problem solving. 相似文献