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51.
52.
In many statistical problems, maximum likelihood estimation by an EM or MM algorithm suffers from excruciatingly slow convergence.
This tendency limits the application of these algorithms to modern high-dimensional problems in data mining, genomics, and
imaging. Unfortunately, most existing acceleration techniques are ill-suited to complicated models involving large numbers
of parameters. The squared iterative methods (SQUAREM) recently proposed by Varadhan and Roland constitute one notable exception.
This paper presents a new quasi-Newton acceleration scheme that requires only modest increments in computation per iteration
and overall storage and rivals or surpasses the performance of SQUAREM on several representative test problems. 相似文献
53.
Kenneth P Gee 《Omega》1973,1(4):515-516
54.
Kenneth Colburn 《Sociological inquiry》1986,56(3):367-380
This paper examines the debate between Gadamer and Habermas concerning the relationship between hermeneutics and critical theory. Formulating the hermeneutical circle in terms of relationship between understanding and interpretation, this paper examines three positions on the circle held by positivism, critical theory and hermeneutics, respectively. A commitment to method and procedure on the part of Habermas is offered as the basis for critical theory's limited acceptance of the hermeneutical circle. This is shown through an analysis of Knowledge and Human Interests as indicative of Habermas's implicit objectivism and his methodical, as opposed to hermeneutical, model of reasoning for social inquiry. The best definition for hermeneutics is: to let what is alienated by the character of the written word or by the character of being distantiated by cultural or historical distances speak again. This is hermeneutics: to let what seems to be far and alienated speak again (Gadamer, 1980a:83). 相似文献
55.
The impression of journalists and social critics in the 1950’s that post-war suburbia was uniformly middle-class has been generally rejected by social scientists, but there is a persisting belief in a high degree of residential segregation by social level in suburbia and in a high degree of socio-economic homogeneity within suburban neighborhoods. A comparison of eight central cities with their suburban zones in 1950 and in 1960 revealed, for both dates, (a) small differences in occupational distributions between the central cities and the suburban zones and (b) generally higher Index of Residential Dissimilarity values for pairs of occupational groups in the central cities. These findings indicate that suburban neighborhoods, at least in the eight suburban zones studied, were little, if any, more occupationally homogeneous than the central city neighborhoods. This suggests that the belief in homogeneous suburban neighborhoods should be added to the growing list of discredited “myths of suburbia. ” 相似文献
56.
A method of analyzing mortality rates in heterogeneous populations is presented. This method, appropriate for the investigation of mortality rates in small geographic areas (e.g., counties) where the forces of mobility operate to selectively “package” persons, is applied to the determination of whether a spatial west-east gradient in cancer mortality rates existed in North Carolina over the period 1970 to 1975. A significant gradient (as well as a significant temporal trend) is determined to exist in the data, though only for particular race, age and sex-specific demographic groups. Several alternate hypotheses are presented to explain the existence of the spatial gradient in these particular demographic groups. 相似文献
57.
58.
Geffken GR Storch EA Gelfand KM Adkins JW Goodman WK 《Journal of psychosocial nursing and mental health services》2004,42(12):44-51
Obsessive-compulsive disorder (OCD) is a chronic, impairing condition with an estimated lifetime prevalence in adults of 2.5%. Controlled treatment trials have demonstrated that cognitive-behavioral therapy (CBT) is an effective intervention for OCD. However, many individuals diagnosed with OCD do not receive appropriate, empirically validated interventions, perhaps due to limited knowledge of CBT among mental health practitioners. This article provides a review of CBT for OCD. Issues related to treatment delivery and assessment are presented and highlighted by an individual example. 相似文献
59.
Reply to Maines 总被引:1,自引:0,他引:1
60.
Goldberg KB Goldberg RE 《Journal of psychosocial nursing and mental health services》2002,40(4):38-41
1. Shaken baby syndrome can lead to substantial neuropsychological deficits that can alter children's normal developmental course. 2. Clinical acumen can be critical in identifying shaken baby syndrome and preventing further difficulties. 3. Education and treatment for caregivers can be important in reducing the likelihood of shaken baby syndrome. 相似文献