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121.
Many follow-up studies involve categorical data measured on the same individual at different times. Frequently, some of the individuals are missing one or more of the measurements. This results in a contingency table with both fully and partially cross-classified data. Two models can be used to analyze data of this type: (i) The multiple-sample model, in which all the study subjects with the same configuration of missing observations are considered a separate sample. (ii) The single-sample model, which assumes that the missing observations are the result of a mechanism causing subjects to lose the informtion from one or some of the measurements. In this work we compare the two approaches and show that under certain conditions, the two models yield the same maximum likelihood estimates of the cell probabilities in the underlying contingency table. 相似文献
122.
123.
J. L. Hutton & Paula R. Williamson 《Journal of the Royal Statistical Society. Series C, Applied statistics》2000,49(3):359-370
Although bias in meta-analysis arising from selective publication has been studied, within-study selection has received little attention. Chronic diseases often have several possible outcome variables. Methods based on the size of the effect allow results from studies with different outcomes to be combined. However, the possibility of selective reporting of outcomes must be considered. The effect of selective reporting on estimates of the size of the effect and significance levels is presented, and sensitivity analyses are suggested. Substantial publication bias could arise from multiple testing of outcomes in a study, followed by selective reporting. Two meta-analyses, on anthelminth therapy and a treatment for incontinence, are reassessed allowing for within-study selection, as it is clear that more outcomes had been measured than were reported. The sensitivity analyses show that the robustness of the anthelminth results is dependent on what assumption one makes about the reporting strategy for the largest trial. The possible influence of correlation between within-child measurements was such that the conclusions could easily be reversed. The effect of a mild assumption on within-trial selection alone could alter general recommendations about the treatment for incontinence. 相似文献
124.
Williams A. Akande Bolanle Eliz Adetoun Modupe Fal Adewuyi Titilola Ikeoluwa E. Akande L. P. Z. Ntshanga Balin Dlamini James T. Williamson Nomvul Dladla Zama Hlongwane Osad Ibeagu Erh J. Osagie 《Social indicators research》2012,107(3):531-560
Emotion??s twin roles?C??unite and divide?? our daily life, thus motivating the good and the worst in human behaviour. The way one ??feels?? does influence the way one ??acts?? toward others. If this reasoning is correct, then behaviour can never be without motive or ??motiveless.?? Given the importance of emotions in human communication and decision making, the context of intergroup relations, with its themes of prejudice, stereotyping and discrimination against culturally dissimilar was touched on selectively. Using the Differential Emotions Scale and building upon Boyle??s (Personality 56:747?C750, 1984) work, with students, the present study reports a repeated-measure multiple discriminant function analysis for items across raters. The findings further indicate that most of the DES items are sensitive indicators. The correspondence of some of the results with prior research findings makes facial emotions less the holy grail of the social behaviour field. Likely consequences of emotions are considered, and research needs are discussed vis-a-vis uplifting individual happiness, collective identity and sense of connection to others. Perhaps its implications can be extended to the literature, thus revealing how the different lenses through which human emotions are usually viewed are connected by the incipient/concept attitude and self-identification/labelling that run through each of them. 相似文献
125.
Yang Y, Williamson JB, Shen C. Social security for China's rural aged: a proposal based on a universal non‐contributory pension Int J Soc Welfare 2010: 19: 236–245 © 2009 The Author(s), Journal compilation © 2009 Blackwell Publishing Ltd and the International Journal of Social Welfare. China's relative lack of social security coverage for rural elders exacerbates the already severe rural–urban economic disparity, slows the rate of rural poverty reduction, and raises social justice concerns. Our analysis draws on evidence from a number of sources including interviews with experts on China, Chinese government documents, Chinese newspaper accounts, and other sources from other countries. Based on our analysis of what has been tried in other countries and the current situation in rural China, we offer some suggestions for Chinese policy makers. We suggest that, for rural China, a universal non‐contributory old‐age pension deserves serious consideration, and refer to our proposed model as a Rural Old‐Age Social Pension. It will reduce the level of poverty in rural areas and the degree of income inequality between rural and urban areas while simultaneously promoting social and political stability. 相似文献
126.
Peter J. Williamson 《英国管理杂志》1990,1(4):215-230
A comparison of pricing policies, price and volume volatility, and investment in distribution, sales and marketing systems across 462 product categories identifies important differences in the strategies of British, Japanese and West German exporters towards the US market. The impact of these strategic choices on the evolution of market share is tested. The results suggest that many British manufacturers' export strategy has been dominated by UK supply and demand considerations. A large proportion of British exports are therefore confined to niches where sensitivity to price fluctuations and ‘stop-start’ supply is low and local distribution support is less important. Products where ‘pull marketing’ dominates are the key exception. Japanese exporters have invested heavily in US distribution and channel support, combined with a policy of stable US prices, aiding long term penetration. West German exporters have built share on technological advantage and direct sales support supplied from Germany to a limited number of customers. 相似文献
127.
Mullins David Rhodes Mary Lee Williamson Arthur 《Voluntas: International Journal of Voluntary and Nonprofit Organizations》2001,12(3):257-278
This paper applies organizational field analysis to compare the structure of the third sector housing fields in Northern Ireland and the Republic of Ireland. Following preliminary accounts of history, structure, funding, and regulation, four key dimensions of field structure are compared: interaction, subgroups, structural equivalence, and patterns of domination. In both fields studied, early steering by the state into specialist roles has been overtaken by state funded expansion in general needs housing--increasing the dominance of larger organizations and tensions around voluntary sector identity. However, differences remain in the extent of domination and tightness of field structure, with greater emphasis on whole organization regulation, and adherence to professional and trade bodies in Northern Ireland. It is also shown how cross-border activity and the espousal of a European model will influence future trajectories. 相似文献
128.
Pitkin J Rees MC Gray S Lumsden MA Marsden J Stevenson JC Williamson J 《Menopause international》2007,13(1):44-45
There has been some confusion among women and health professionals since the publication of the Women's Health Initiative and Million Women studies about the management of premature ovarian failure (POF). Both studies were undertaken in women aged 50 and over, and cannot be extrapolated to their younger counterparts, who would normally be producing their endogenous estrogen, since they have functioning ovaries. Estrogen-based replacement therapy is the main stay of treatment for women with POF and is recommended at least until the average age of natural menopause (52 years in the UK). This view is endorsed by regulatory bodies such as the Committee on Safety of Medicines (now the Commission on Human Medicines) in the UK. No evidence shows that estrogen replacement increases the risk of breast cancer to a level greater than that found in normally menstruating women, and women with POF do not need to start mammographic screening early unless other risk factors are present, such as family history. 相似文献
129.
A number of prior studies have attempted to account for cross-national differences in infant mortality rate using a variety of economic, demographic, and health related variables. These studies have given relatively little attention to the impact of predictors measuring the status of women. The present study, based on a sample of 96 less developed countries circa 1990, tests a series of hypotheses derived from gender stratification theory and industrialism theory. Evidence is presented of an inverse relationship between the status of women and infant mortality rate. The present study shows that it makes a difference whether we use relative or absolute measures of women's status and it shows that in addition to women's educational status, other dimensions of women's status particularly economic status and autonomy are also important predictors of infant mortality rate. 相似文献
130.
This paper reports an evaluation of a rural activity project for people with learning difficulties. The project is situated in (but not a regular part of) an agriculture college. Both statutory and voluntary interests are represented in the management of the scheme, which is funded by the All Wales Strategy for the Mentally Handicapped through the local authority. Despite the widespread presence of ideas about normalization and carer participation, key stakeholders in the project appeared to draw on various aspects of three different models in describing, assessing and participating in the work of the scheme: a training for work model, a personal and social growth model, and an education for life model. We explore the question of whether such contrasting views can be tolerated in a single project, and their implications for policy and practice decisions. Each model has its distinctive consequences for project aims, selection, programme planning, staffing requirements, future development objectives and desirable project outcomes. The debate has implications for the way in which policies of normalization are operationalized in and beyond the field of learning difficulties. 相似文献