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Feng Chen Richard M. Huggins Paul S. F. Yip K. F. Lam 《Journal of the Royal Statistical Society. Series C, Applied statistics》2008,57(4):447-459
Summary. The system for monitoring suicides in Hong Kong has considerable delays in reporting as the cause of death needs to be determined by a coroner's investigation. However, timely estimates of suicide rates are desirable to assist in the formulation of public health policies. This motivated us to develop a non-parametric procedure to estimate the intensity function of a Poisson process in the presence of reporting delays. We give closed form estimators of the Poisson intensity and the delay distribution, conduct simulation studies to evaluate the method proposed and derive their asymptotic properties. The method proposed is applied to estimate the intensity of suicide in Hong Kong. 相似文献
3.
Robin Camille Davis 《Serials Review》2020,46(3):193-200
Abstract This case study focuses on user research that was conducted to enhance our users’ ebook discovery experience. We took an outward-facing approach by seeking the users’ perspectives. We wanted to know: How do users find ebooks? How do they perceive multiple records for the same title? Would users find additional metadata useful, such as download availability, file format, and chapter titles? We coordinated guerilla usability testing in our library lobby, inspired by low-overhead, high-impact user experience work at other academic libraries. The resulting data gave us a much-needed new perspective of ebook usage that supplements what we already know from our day-to-day work. 相似文献
4.
Simultaneous model-based clustering and visualization in the Fisher discriminative subspace 总被引:1,自引:0,他引:1
Clustering in high-dimensional spaces is nowadays a recurrent problem in many scientific domains but remains a difficult task
from both the clustering accuracy and the result understanding points of view. This paper presents a discriminative latent
mixture (DLM) model which fits the data in a latent orthonormal discriminative subspace with an intrinsic dimension lower
than the dimension of the original space. By constraining model parameters within and between groups, a family of 12 parsimonious
DLM models is exhibited which allows to fit onto various situations. An estimation algorithm, called the Fisher-EM algorithm,
is also proposed for estimating both the mixture parameters and the discriminative subspace. Experiments on simulated and
real datasets highlight the good performance of the proposed approach as compared to existing clustering methods while providing
a useful representation of the clustered data. The method is as well applied to the clustering of mass spectrometry data. 相似文献
5.
Nonparametric Estimation of the Number of Drug Users in Hong Kong Using Repeated Multiple Lists
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Richard M. Huggins Paul S.F. Yip Jakub Stoklosa 《Australian & New Zealand Journal of Statistics》2016,58(1):1-13
We update a previous approach to the estimation of the size of an open population when there are multiple lists at each time point. Our motivation is 35 years of longitudinal data on the detection of drug users by the Central Registry of Drug Abuse in Hong Kong. We develop a two‐stage smoothing spline approach. This gives a flexible and easily implemented alternative to the previous method which was based on kernel smoothing. The new method retains the property of reducing the variability of the individual estimates at each time point. We evaluate the new method by means of a simulation study that includes an examination of the effects of variable selection. The new method is then applied to data collected by the Central Registry of Drug Abuse. The parameter estimates obtained are compared with the well known Jolly–Seber estimates based on single capture methods. 相似文献
6.
The estimation of abundance from presence–absence data is an intriguing problem in applied statistics. The classical Poisson model makes strong independence and homogeneity assumptions and in practice generally underestimates the true abundance. A controversial ad hoc method based on negative‐binomial counts (Am. Nat.) has been empirically successful but lacks theoretical justification. We first present an alternative estimator of abundance based on a paired negative binomial model that is consistent and asymptotically normally distributed. A quadruple negative binomial extension is also developed, which yields the previous ad hoc approach and resolves the controversy in the literature. We examine the performance of the estimators in a simulation study and estimate the abundance of 44 tree species in a permanent forest plot. 相似文献
7.
Jordan Belisle Kate Huggins Meghan Doherty Caleb R. Stanley Mark R. Dixon 《The Analysis of verbal behavior》2020,36(2):233
We sought to evaluate the efficacy of successive matching training for establishing generalized reflexive matching across 4 children with autism. In Experiment 1, differential reinforcement with delay fading was efficacious in establishing “yes” and “no” matching and nonmatching responses in 2 participants when 2 identical or nonidentical picture stimuli were presented. In addition, emergent visual–visual reflexive relational responses were observed using novel picture stimuli in a transfer test phase. In Experiment 2, differential reinforcement alone was efficacious in establishing matching and nonmatching responses in the other 2 participants when 2 identical or nonidentical objects were presented. Transfer to identical objects presented through touch (i.e., tactile discrimination) was additionally observed for both participants. Procedures in the study were adapted from the PEAK Relational Training System to aid in clinical replication, and the translational results have implications for language training with individuals with autism. 相似文献
8.
ABSTRACTThe authors discuss transference enactments that occur during cross-cultural supervision. Previous research has shown that few mental health professionals willingly talk about race during supervision and that White supervisees experience significant difficulty when directly engaged in discussions about race. They introduce a new phenomenon, “stereotypical” transference enactments, as a means for understanding the countertransference Black female clinical supervisors experience during clinical supervision of White supervisees. The findings indicated that effective cross-cultural supervision should address the intersectionality of race and gender to enhance the development of multicultural clinical skills. The clinical and educational challenges are discussed by using two case vignettes. 相似文献
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Rossetti J Jones-Bendel T Portell P Kunz M Sobotka MJ King C Marek K 《Journal of psychosocial nursing and mental health services》2012,50(5):42-46
In the behavioral health environment, nurses often use continuous staff monitoring and, at times, physical restraints, to manage the severity of patients' self-injury. Both options put staff in control, are the most restrictive in nature, and can be financially draining on the hospital's budget. This can result in negative reactions by both patients and staff. It is important to develop a program that will empower patients to control their behavior and allow staff to be aware of their perceptions and attitudes toward patients who self-injure. This article describes the leadership initiative that drove the development, training, and implementation of a self-injury prevention project and the lessons learned by staff. 相似文献