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91.
92.
Martin A. Hamilton 《统计学通讯:理论与方法》2013,42(7):2207-2266
This paper contains an annotated bibliography of 316 papers and books relevant to model validation, with emphasis on articles of potential interest to statisticians. The bibliography is accompanied by a brief introduction, a list of some important areas for statistical research, a short glossary, and a key word index. 相似文献
93.
David C. Hamilton & O. Knop 《Journal of the Royal Statistical Society. Series C, Applied statistics》1998,47(2):173-185
Methods of estimation and inference are presented for the situation where two non-linear regression models with unequal error variances contain some parameters in common. Such a situation arises in structural chemistry, when bond lengths are available for three nearly collinear atoms in crystals and a model is required to quantify the extent and form of the relationship between the longer and the shorter bond. Some atomic triples are symmetric and require a different model and error variance from those required by the asymmetric triples. The profile likelihood for the regression parameters is a weighted sum of the logarithms of the sums-of-squares functions from each model, and the estimates can be obtained by using a simple modification to a standard non-linear least squares program. A likelihood ratio test for assessing whether the parameters in common are equal is described. When these techniques are applied to two data sets consisting of bond lengths for bromine–tellurium–bromine and sulphur–tellurium–sulphur triples, there is no evidence against the equality hypothesis. An extension to the model to allow for a non-constant variance is required for proper analysis of the sulphur–tellurium–sulphur data. 相似文献
94.
Carol Hamilton 《Disability & Society》2015,30(7):1055-1070
In 2004 an intervention known as the Ashley Treatment (AT) was sought on behalf of Ashley X, a girl with severe developmental disabilities. A discursive interpretive framework is used to investigate use of the AT in the case of Charley Hooper in New Zealand in 2009. This investigation found that use of the AT is intimately bound up in ideas about worthiness of life related to the ability to act as an autonomous agent within social structures. Questions this case raises about ethical decision-making and future physical and social requirements for profoundly disabled young people in the future are posed. 相似文献
95.
Tatjana Meschede Darrick Hamilton Ana Patricia Muñoz Regine Jackson William DarityJr. 《Race and social problems》2016,8(1):18-28
New data collected for the Boston Metropolitan Statistical Area provide detailed information on financial assets that allow analysis to extend beyond the traditional black–white divide. Targeting US-born blacks, Caribbean blacks, Puerto Ricans, Dominicans, and other Hispanics, findings from the National Asset Scorecard for Communities of Color survey underscore the large racial and ethnic disparities in financial wealth, even after controlling for demographic and socioeconomic status. Further, some notable differences between Boston’s communities of color highlight the importance of detailed analyses for research on the racial wealth gap. In particular, among non-white communities Dominicans report comparatively low asset and high debt amounts, while Caribbean blacks report relatively higher levels of wealth. Altogether, these findings point to the need for wealth building opportunities in communities of color and further investigation of the causes and consequences of financial disparities between groups of color disaggregated by specific ancestral origin. 相似文献
96.
With the advent of more advanced treatments and therapies, people with HIV/AIDS are experiencing significant improvements in their health, making many of their ongoing employment and career goals more realistic. However, people with HIV/AIDS continue to have major concerns regarding the impact of working on their benefits and entitlements, including apprehensions about potential economic hardships related to loss of financial supports and health insurance coverage. This article focuses on factors related to employment status, sources of health benefits, and entitlements among people with HIV/AIDS. In addition, results of the study demonstrate differences in employment status, benefit types, and the amount of financial support individuals receive based on gender. 相似文献
97.
Matthias Schmid Sergej Potapov Annette Pfahlberg Torsten Hothorn 《Statistics and Computing》2010,20(2):139-150
Boosting is one of the most important methods for fitting regression models and building prediction rules. A notable feature
of boosting is that the technique can be modified such that it includes a built-in mechanism for shrinking coefficient estimates
and variable selection. This regularization mechanism makes boosting a suitable method for analyzing data characterized by
small sample sizes and large numbers of predictors. We extend the existing methodology by developing a boosting method for
prediction functions with multiple components. Such multidimensional functions occur in many types of statistical models,
for example in count data models and in models involving outcome variables with a mixture distribution. As will be demonstrated,
the new algorithm is suitable for both the estimation of the prediction function and regularization of the estimates. In addition,
nuisance parameters can be estimated simultaneously with the prediction function. 相似文献
98.
In this, article we consider a Bayesian approach to the problem of ranking the means of normal distributed populations, which is a common problem in the biological sciences. We use a decision-theoretic approach with a straightforward loss function to determine a set of candidate rankings. This loss function allows the researcher to balance the risk of not including the correct ranking with the risk of increasing the number of rankings selected. We apply our new procedure to an example regarding the effect of zinc on the diversity of diatom species. 相似文献
99.
100.
Ra Hamilton 《Omega》1986,14(6)
Applications of DDP are examined via two case studies to determine how the technology was used by management to aid decision-making; the level of management involvement in the MIS (Management Information Systems) design process and the nature of the relationship between managers and data processing departments were also considered. The study showed that because the technology was largely under end user control, better tailored information systems resulted and system output was more directly used by middle and top managers. This only occurred, however, if certain moderators, such as computing and modelling skills, were present in functional departments. DDP also offers opportunities for better relationships with data processing departments but the consequences include the need for better management training and functional support groups for systems implementation. A conceptual model is presented as a theoretical framework to guide organisations when using DDP. 相似文献