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61.
Kelley M. Kidwell Nicholas J. Seewald Qui Tran Connie Kasari Daniel Almirall 《Journal of applied statistics》2018,45(9):1628-1651
In behavioral, educational and medical practice, interventions are often personalized over time using strategies that are based on individual behaviors and characteristics and changes in symptoms, severity, or adherence that are a result of one's treatment. Such strategies that more closely mimic real practice, are known as dynamic treatment regimens (DTRs). A sequential multiple assignment randomized trial (SMART) is a multi-stage trial design that can be used to construct effective DTRs. This article reviews a simple to use ‘weighted and replicated’ estimation technique for comparing DTRs embedded in a SMART design using logistic regression for a binary, end-of-study outcome variable. Based on a Wald test that compares two embedded DTRs of interest from the ‘weighted and replicated’ regression model, a sample size calculation is presented with a corresponding user-friendly applet to aid in the process of designing a SMART. The analytic models and sample size calculations are presented for three of the more commonly used two-stage SMART designs. Simulations for the sample size calculation show the empirical power reaches expected levels. A data analysis example with corresponding code is presented in the appendix using data from a SMART developing an effective DTR in autism. 相似文献
62.
Nguyen Ngoc Anh Nguyen Van Chuc Bui Hung Thang Pham Van Nhat NguyenVan Hao Doan Dinh Phuong Phan Ngoc Minh Thiyagu Subramani Naoki Fukata Pham Van Trinh 《Global Challenges》2020,4(9)
Solar energy is considered as a potential alternative energy source. The solar cell is classified into three main types: i) solar cells based on bulk silicon materials (monocrystalline, polycrystalline), ii) thin‐film solar cells (CIGS, CdTe, DSSC, etc.), and iii) solar cells based on nanostructures and nanomaterials. Nowadays, commercial solar cells are usually made by bulk silicon material, which requires not only high fabrication costs but also limited performance. In this study, the fabrication of high‐performance solar cells based on hybrid structure of silicon nanowires/poly(3,4‐ethylenedioxythiophene):poly(styrenesulfonate)/graphene (SiNW/PEDOT:PSS/Gr) is focused upon. SiNWs with different lengths of 125, 400, 800 nm, and 2 µm are fabricated by a metal‐assisted chemical etching method, and their influence on the performance of the hybrid solar cells is studied and investigated. The experimental results indicate that the suitable SiNW length for the fabrication of the hybrid solar cells is about 400 nm and the best power conversion efficiency obtained is about 9.05%, which is about 2.1 times higher than that of the planar Si solar cell. 相似文献
63.
Society in general, and emerging economies in particular, face several challenges related to the rapid rate of technological change, increasing urbanization, and the degradation of the quality of life that results from air and noise pollution caused by road traffic. The apparently simple task of finding a parking space is one of the prime causes of pollution and congestion in inner‐city areas. The so‐called intelligent traffic systems and smart parking systems are believed to be one answer to alleviating this problem. This article evaluates the effectiveness of a smart parking system introduced by the state of Penang in Malaysia. It offers a review of smart parking systems and provides data from a survey of 646 Penang residents concerning the recently launched Penang Smart Parking system. The findings provide new insights and knowledge for the Malaysian government and could be used to identify critical success factors for smart parking systems in other cities. 相似文献
64.
AbstractThis paper develops almost sure convergence for sums of negatively superadditive dependent random vectors in Hilbert spaces, we obtain Chung type SLLN and the Jaite type SLLN for sequences of negatively superadditive dependent random vectors in Hilbert spaces. Rate of convergence is studied through considering almost sure convergence to 0 of tail series. As an application, the almost sure convergence of degenerate von Mises-statistics is investigated. 相似文献
65.
ABSTRACTIn this internationalised world, graduate employability in terms of intercultural communication skills needs to be taken into account in higher education. The present study aims to explore the effects of critical incident task instruction on English non-majored undergraduates’ intercultural competence. One group of students received ten weeks of instruction with one critical incident task per week and another group received standard English classes. Data were collected from the students’ pre- and post-test. The results showed a significant and strong effect of the intervention with critical incident tasks. Implications for educational practice are presented for further teaching with critical incident tasks. 相似文献
66.
In this article, we provide a semiparametric approach to the joint measurement of technical and allocative inefficiency in a way that the internal consistency of the specification of allocative errors in the objective function (e.g., cost function) and the derivative equations (e.g., share or input demand functions) is assured. We start from the Cobb–Douglas production and shadow cost system. We show that the shadow cost system has a closed-form likelihood function contrary to what was previously thought. In turn, we use the method of local maximum likelihood applied to a system of equations to obtain firm-specific parameter estimates (which reveal heterogeneity in production) as well as measures of technical and allocative inefficiency and its cost. We illustrate its practical application using data on U.S. electric utilities. 相似文献
67.
This article presents a comprehensive review and comparison of the Monte Carlo and quasi-Monte Carlo sampling techniques, which are widely used in numerical integration, simulation, and optimization. Monte Carlo sampling involves the generation of pseudorandom numbers or vectors to estimate unknown quantities of interest. In contrast, quasi-Monte Carlo sampling is specialized for situations where uniformity and reduced variance are important. It generates a deterministic low-discrepancy sequence that spans the entire sampling space. This review aims to analyze the strengths and distinctions of these two sampling methodologies, offering valuable insights to researchers in search of sampling techniques aligned with their specific research objectives and needs. Furthermore, it seeks to equip practitioners with efficient algorithms for practical implementations. 相似文献
68.
ABSTRACTReflection of feelings is a hallmark strategy of non-directive child-centred play therapy that enhances children’s emotional awareness and equips them with emotionally expressive words. The case presented here describes the application of child-centred play therapy by a social worker with two young children (aged four and six) with sibling rivalry issues. One of the sessions was videotaped, which enabled the use of conversation analysis to dissect the language patterns used by both the clients and the social worker. This in-depth verbal analysis illuminated subtle nuances in the children’s interactions and behaviour while also providing the social worker with the opportunity to reflect on practice. This case discussion presents a snapshot of that session and allows readers to understand how such therapy occurs. 相似文献
69.
70.
This article describes a full Bayesian treatment for simultaneous fixed-effect selection and parameter estimation in high-dimensional generalized linear mixed models. The approach consists of using a Bayesian adaptive Lasso penalty for signal-level adaptive shrinkage and a fast Variational Bayes scheme for estimating the posterior mode of the coefficients. The proposed approach offers several advantages over the existing methods, for example, the adaptive shrinkage parameters are automatically incorporated, no Laplace approximation step is required to integrate out the random effects. The performance of our approach is illustrated on several simulated and real data examples. The algorithm is implemented in the R package glmmvb and is made available online. 相似文献