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41.
42.
In this paper we introduce a latent variable model (LVM) for mixed ordinal and continuous responses, where covariate effects
on the continuous latent variables are modelled through a flexible semiparametric Gaussian regression model. We extend existing
LVMs with the usual linear covariate effects by including nonparametric components for nonlinear effects of continuous covariates
and interactions with other covariates as well as spatial effects. Full Bayesian modelling is based on penalized spline and
Markov random field priors and is performed by computationally efficient Markov chain Monte Carlo (MCMC) methods. We apply
our approach to a German social science survey which motivated our methodological development.
We thank the editor and the referees for their constructive and helpful comments, leading to substantial improvements of a
first version, and Sven Steinert for computational assistance. Partial financial support from the SFB 386 “Statistical Analysis
of Discrete Structures” is also acknowledged. 相似文献
43.
Objecting Morally 总被引:1,自引:0,他引:1
C.A.J. Coady 《The Journal of Ethics》1997,1(4):375-397
Just war theory entails that some wars may be morally unjustifiable, and hence citizens may be right to object morally to their government's waging of a war and to their being compelled to serve in it. Given the evils attendant upon even justified war, this fact sharply restricts any obligation to die for the state, and raises important questions about the appropriate state response to selective conscientious objectors. This paper argues that such people should be legally accommodated, and discusses objections to doing so, in particular, the possible erosion of the state's capacity to wage justified war, the unfairness of granting such exemptions from military service, and the impossibility of determining genuinely conscientious objection. 相似文献
44.
Effects on responding of mixed and multiple schedules of signalled and unsignalled response-dependent electric-shock delivery
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Hymowitz N 《Journal of the experimental analysis of behavior》1976,25(3):321-326
Responding in two rats was maintained under mixed and multiple variable-interval 35-sec variable-interval 35-sec food delivery schedules. Similar rates and patterns of responding occurred in each component of the two schedules. Mixed and multiple variable-interval 65-sec variable-interval 65-sec schedules of response-dependent shock delivery were super-imposed on the mixed and multiple baseline food schedules, respectively. In one component, a 5-sec stimulus was presented on the average of once every 65 sec. Offset of the stimulus arranged that the next response would produce shock. In the other component, no stimulus was presented during the 5-sec period. The mixed schedule of signalled and unsignalled dependent shock delivery yielded similar degrees of response suppression in each component, but the multiple schedule of shock delivery revealed differential degrees of response suppression. Considerably more suppression occurred in the component not associated with the preshock stimulus, thus implicating the discriminative functions of the correlated stimulus. 相似文献
45.
Chris M. Coombe P. Paul Chandanabhumma Prachi Bhardwaj Barbara L. Brush Ella Greene-Moton Megan Jensen Laurie Lachance S.Y. Daniel Lee Melanie Meisenheimer Meredith Minkler Michael Muhammad Angela G. Reyes Zachary Rowe Eliza Wilson-Powers Barbara A. Israel 《American journal of community psychology》2020,66(3-4):427-438
46.
Participants rated the attractiveness and racial typicality of male faces varying in their facial features from Afrocentric to Eurocentric and in skin tone from dark to light in two experiments. Experiment 1 provided evidence that facial features and skin tone have an interactive effect on perceptions of attractiveness and mixed-race faces are perceived as more attractive than single-race faces. Experiment 2 further confirmed that faces with medium levels of skin tone and facial features are perceived as more attractive than faces with extreme levels of these factors. Black phenotypes (combinations of dark skin tone and Afrocentric facial features) were rated as more attractive than White phenotypes (combinations of light skin tone and Eurocentric facial features); ambiguous faces (combinations of Afrocentric and Eurocentric physiognomy) with medium levels of skin tone were rated as the most attractive in Experiment 2. Perceptions of attractiveness were relatively independent of racial categorization in both experiments. 相似文献
47.
刘少稳 《医学与哲学(人文社会医学版)》2011,(8):14-16
慢性心房颤动(房颤)的基本导管消融方法包括环肺静脉消融隔离、复杂碎裂心房电位消融和线性消融,肺静脉外异位兴奋灶的消融和基质改良是提高慢性房颤消融成功率的有效方法,复合式或个体化消融方案是治疗慢性房颤的趋势,但是如何针对不同患者选择个体化的消融策略进一步提高慢性房颤消融的有效性仍是一大挑战。 相似文献
48.
The initial purpose of the present study was to replicate procedures for teaching preschool children to recruit attention at appropriate times by having an experimenter signal the availability and unavailability of attention (i.e., arrange a multiple schedule involving reinforcement and extinction; Tiger & Hanley, 2004). Following the development of discriminated social responding, the schedule-correlated stimuli were removed (i.e., a mixed schedule of reinforcement was arranged). However, discriminated responding continued during these conditions. Further evaluation suggested that stimulus control over children's social responding had transferred from the schedule-correlated stimuli to the delivery of reinforcement. The effect of a history of reinforcement under multiple-schedule conditions on performance under mixed schedules was then replicated with 2 participants in a reversal design. These findings suggest that following experience with schedule-correlated stimuli, these stimuli may be removed with only modest disruption to discriminated responding. 相似文献
49.
Rider DP 《Journal of the experimental analysis of behavior》1979,31(2):225-237
Rats were trained on concurrent fixed-ratio variable-ratio or concurrent fixed-ratio mixed-ratio schedules of food reinforcement. The variable-ratio schedule was composed of an arithmetic sequence of 11 ratios that averaged 50; the mixed-ratio schedule consisted of equiprobable ratios of 1 and 99. Fixed-ratio values, varied over experimental conditions, included 25, 35, 50, 60, and 99. The proportion of responses and time allocated to the variable- or mixed-ratio schedule increased as the size of the fixed ratio increased. For most subjects, higher proportions of responses and time were maintained on the fixed-ratio schedule at fixed-ratio values of 25 and 35; higher proportions of responses and time were maintained on the variable- or mixed-ratio schedule at fixed-ratio values of 50 or higher. On concurrent variable-ratio fixed-ratio schedules, the tendency for responding to be maintained exclusively by one schedule was related to the difference in local reinforcement rates obtained from those schedules. Exclusive responding was approximated when the difference in local reinforcement rates obtained from those schedules was large; responding was more evenly distributed between the schedules as the difference in the rates at which reinforcement was obtained from each decreased. 相似文献
50.
Reinforcement contingencies as discriminative stimuli: II. Effects of changes in stimulus probability.
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K A Lattal 《Journal of the experimental analysis of behavior》1979,31(1):15-22
Three pigeons were trained on a matching procedure involving a sample component and a choice component. Responding in the sample component, according to either a differential-reinforcement-of-low-rate schedule on some trials or a differential-reinforcement-of-other-behavior schedule on other trials, produced access to the choice component in which each of two keys was illuminated with a unique color. The correct choice response was defined by the contingency that was met to produce the choice. The food hopper operated for 1.5 seconds following an appropriate sample response and for 3 seconds following a correct choice response. A signal-detection analysis showed that variations in the probability of presentation of the different contingencies systematically affected response bias but not sensitivity to the contingencies as stimuli. Substitution of a blackout for food at the end of the sample component did not differentially affect performance, but elimination of the delay between sample and choice components generally increased the sensitivity measure. The findings suggest a role for reinforcement contingency discrimination in schedule-controlled responding. 相似文献