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241.
242.
We propose a more efficient version of the slice sampler for Dirichlet process mixture models described by Walker (Commun.
Stat., Simul. Comput. 36:45–54, 2007). This new sampler allows for the fitting of infinite mixture models with a wide-range of prior specifications. To illustrate
this flexibility we consider priors defined through infinite sequences of independent positive random variables. Two applications
are considered: density estimation using mixture models and hazard function estimation. In each case we show how the slice
efficient sampler can be applied to make inference in the models. In the mixture case, two submodels are studied in detail.
The first one assumes that the positive random variables are Gamma distributed and the second assumes that they are inverse-Gaussian
distributed. Both priors have two hyperparameters and we consider their effect on the prior distribution of the number of
occupied clusters in a sample. Extensive computational comparisons with alternative “conditional” simulation techniques for
mixture models using the standard Dirichlet process prior and our new priors are made. The properties of the new priors are
illustrated on a density estimation problem. 相似文献
243.
244.
Ernesto Lopez-Valeiras Maria Beatriz Gonzalez-Sanchez Jacobo Gomez-Conde 《Review of Managerial Science》2016,10(3):487-510
This study examines how the interactive use of management control systems (iMCS) affects process and organizational innovation. Firstly, it is postulated that iMCS directly influences the development of process and organizational innovations. Secondly, we argue in favor of a moderating role of iMCS in the relationship between innovation and financial performance. Most studies of MCS and innovation have focused on new product development. However, process and organizational innovations follow innovation patterns that clearly differ from product innovation. The research model is empirically examined using data collected from a survey of 230 firms. Results from a structural model tested applying Partial Least Squares regression, controlling for size, family ownership, R&D, and product innovation, reveal that iMCS fosters process and organizational innovation. Results also suggest that iMCS could play a moderator role in the relationship between process innovation and financial performance. These findings highlight the role of iMCS in process and organizational innovation, expanding previous literature on Simons’ Levers of Control and innovation. The results are also discussed with regard to their managerial implications. 相似文献
245.
A finite mixture of Tobit models is suggested for estimation of regression models with a censored response variable. A mixture of models is not primarily adapted due to a true component structure in the population; the flexibility of the mixture is suggested as a way of avoiding non-robust parametrically specified models. The new estimator has several interesting features. One is its potential to yield valid estimates in cases with a high degree of censoring. The estimator is in a Monte Carlo simulation compared with earlier suggestions of estimators based on semi-parametric censored regression models. Simulation results are partly in favor of the proposed estimator and indicate potentials for further improvements. 相似文献
246.
Causal effects are usually estimated under the assumption of no interference between individuals. This assumption means that the potential outcomes for one individual are unaffected by the treatments received by other individuals. In many situations, this is not reasonable to assume. Moreover, not taking interference into account could result in misleading conclusions about the effect of a treatment. For two-stage observational studies, where treatment assigment is randomized in the first stage but not in the second stage, we propose IPW estimators of direct and indirect causal effects as defined by Hudgens and Halloran (J Am Stat Assoc 103(482):832–842, 2008) for two-stage randomized studies. We illustrate the use of these estimators in an evaluation study of an implementation of Triple P (a parenting support program) within preschools in Uppsala, Sweden. 相似文献
247.
The potential power of social policy programmes: income redistribution,economic resources and health
Olle Lundberg Johan Fritzell Monica Åberg Yngwe Maria L. Kölegård 《International Journal of Social Welfare》2010,19(Z1):S2-S13
Lundberg O, Fritzell J, Åberg Yngwe M, Kölegård ML. The potential power of social policy programmes: income redistribution, economic resources and health Int J Soc Welfare 2010: ??: ??–??© 2010 The Author(s), Journal compilation © 2010 Blackwell Publishing Ltd and International Journal of Social Welfare. This Supplement includes a number of articles dealing with the role of social policy schemes for public health across the life course. As a key social determinant of health, poverty and its consequences have historically been at the forefront of the public health discussion. But also in rich countries today, economic resources are likely to be important for health and survival, both on an individual and an aggregate level. This introductory article serves as a background for the more specific analyses that follow. The focus is on why income and income inequality could have an effect on individual and population health. We discuss relationships between the individual and population levels and between income and health, and some of the possible mechanisms involved. We also present arguments for why welfare state institutions may matter. 相似文献
248.
Jaromír Antoch Luboš Prchal Maria Rosaria De Rosa Pascal Sarda 《Journal of applied statistics》2010,37(12):2027-2041
A functional linear regression model linking observations of a functional response variable with measurements of an explanatory functional variable is considered. This model serves to analyse a real data set describing electricity consumption in Sardinia. The interest lies in predicting either oncoming weekends’ or oncoming weekdays’ consumption, provided actual weekdays’ consumption is known. A B-spline estimator of the functional parameter is used. Selected computational issues are addressed as well. 相似文献
249.
The results of this paper are the continuation of the research presented by Bieniek [Optimal bounds for the mean of the total time on test for distributions with decreasing generalized failure rate. Statistics. 2016;50:1206–1220]. We consider the remaining total time on test after a given failure in a life test experiment. We derive sharp upper bounds on the mean of the total time on test optimal in the class of distributions with increasing generalized failure rate with respect to generalized Pareto distributions. Specific results are obtained for distributions with increasing density and increasing failure rate. We also provide exemplary numerical values of the obtained bounds and we compare them with the corresponding bounds for distributions with decreasing generalized failure rate. 相似文献
250.
Kirstin R. Painter Maria Scannapieco Gary Blau Amy Andre Kris Kohn 《Journal of social service research》2018,44(2):223-235
ABSTRACTThe purpose of this groundbreaking study was to evaluate outcomes of 482 LGBTQ (lesbian, gay, bisexual, transgender, or questioning) youth and young adults who received services and supports through the Comprehensive Community Mental Health Services for Children with Serious Emotional Disturbances Program (CMHI). This study was a secondary data analysis using data from a larger study of 3208 LGBTQ and non-LGBTQ youth ages 11 through 21 who had a serious emotional disturbance (SED). This study is significant in that it evaluates functional outcomes for young people identified as LGBTQ based on a specialized service framework (i.e., system of care approach). In essence, do LGBTQ youth with SED benefit from a specific approach to intervention? In addition, a comparison at intake on suicidality, bullying and victimization was conducted between the LGBTQ and non-LGBTQ identifying youth from the larger sample. The youth and a caregiver were interviewed face-to-face separately at intake, 6-months, and 12-months. Significant improvements were found across all of the dependent variables, supporting the viability of SOC for improving outcomes for LGBTQ youth. Future research should continue to build on this study by adding to the design a control group to improve internal validity of the findings. 相似文献