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81.
Ward A 《Theoretical medicine and bioethics》2007,28(6):465-485
The goal of research in social epidemiology is not simply conceptual clarification or theoretical understanding, but more
importantly it is to contribute to, and enhance the health of populations (and so, too, the people who constitute those populations).
Undoubtedly, understanding how various individual risk factors such as smoking and obesity affect the health of people does
contribute to this goal. However, what is distinctive of much on-going work in social epidemiology is the view that analyses
making use of individual-level variables is not enough. In the spirit of Durkheim and Weber, S. Leonard Syme makes this point
by writing that just “as bad water and food may be harmful to our health, unhealthful forces in our society may be detrimental
to our capacity to make choices and to form opinions” conducive to health and well-being. Advocates of upstream (distal) causes
of adverse health outcomes propose to identify the most important of these “unhealthful forces” as the fundamental causes
of adverse health outcomes. However, without a clear, theoretically precise and well-grounded understanding of the characteristics
of fundamental causes, there is little hope in applying the statistical tools of the health sciences to hypotheses about fundamental
causes, their outcomes, and policies intended to enhance the health of populations. This paper begins the process of characterizing
the social epidemiological concept of fundamental cause in a theoretically respectable and robust way.
相似文献
Andrew WardEmail: |
82.
时间变量对大学新生人格特质的影响 总被引:1,自引:0,他引:1
以台湾地区某大学新生,从1998至2003共六届3141人为对象,分析人格改变情形,统计结果发现13项人格特质的赖氏人格量表中达显著差异的有6项,包括社会外向、攻击性、变异性、神经质、自卑感及虚伪性。性别分析达显著差异的共7项,包括活动性、客观性、协调性、攻击性、变异性、自卑感及神经质;男学生显著高于女学生的有活动性及攻击性,女学生显著高于男学生的有客观性、协调性、变异性、自卑感及神经质。结果显示在时间变量中,大学新生的人格的确发生了转变。 相似文献
83.
Yanchun Xing Wenqing Ma Ningzhong Shi Yuan Wang 《The Japanese psychological research》2014,56(3):243-253
In this paper, we develop a latent processing ability model to analyze the speed of processing ability data. Our approach can not only effectively evaluate the effects of covariates on the latent processing ability, but also estimate the latent trait of each child by calculating its posterior mean. In addition, we derive the correlations structure of latent traits among different age groups. Simulations are conducted to evaluate the performance of our proposed model. The results indicated that the estimation of model parameters is satisfactory overall. The method is evaluated using real data from children aged 4–7 years in Changchun, China. 相似文献
84.
严格意义的实验可重复性指的是实验控制条件不变的情况下其结果的可重复性,置信区间是表示这种可重复性的恰当方法,可重复性的提高可通过在实验设计和数据分析中将影响因变量的随机额外变量作为协变量引入来实现;另一种意义的可重复性指的是实验结果的可迁移性,它涉及当控制条件变化时因控制变量和自变量的交互作用而导致的实验结果的变化。在这两种意义下,心理学实验较低的可重复性都源于它的额外变量的庞杂。 相似文献
85.
本研究通过蒙特卡洛模拟考查了采用全息极大似然估计进行缺失数据建模时辅助变量的作用。具体考查了辅助变量与研究变量的共缺机制、共缺率、相关程度、辅助变量数目与样本量等因素对参数估计结果精确性的影响。结果表明,当辅助与研究变量共缺时:(1)对于完全随机缺失的辅助变量,结果更容易出现偏差;(2)对于MAR-MAR组合机制,纳入单个辅助变量是有益的;对于MAR-MCAR或MAR-MNAR组合机制,纳入多于一个辅助变量的效果更好;(3)纳入与研究变量低相关的辅助变量对结果也是有益的。 相似文献
86.
Adam R. Cassidy 《Child neuropsychology》2016,22(3):292-317
The objective of this study was to establish latent executive function (EF) and psychosocial adjustment factor structure, to examine associations between EF and psychosocial adjustment, and to explore potential development differences in EF-psychosocial adjustment associations in healthy children and adolescents. Using data from the multisite National Institutes of Health (NIH) magnetic resonance imaging (MRI) Study of Normal Brain Development, the current investigation examined latent associations between theoretically and empirically derived EF factors and emotional and behavioral adjustment measures in a large, nationally representative sample of children and adolescents (7–18 years old; N = 352). Confirmatory factor analysis (CFA) was the primary method of data analysis. CFA results revealed that, in the whole sample, the proposed five-factor model (Working Memory, Shifting, Verbal Fluency, Externalizing, and Internalizing) provided a close fit to the data, χ2(66) = 114.48, p < .001; RMSEA = .046; NNFI = .973; CFI = .980. Significant negative associations were demonstrated between Externalizing and both Working Memory and Verbal Fluency (p < .01) factors. A series of increasingly restrictive tests led to the rejection of the hypothesis of invariance, thereby precluding formal statistical examination of age-related differences in latent EF-psychosocial adjustment associations. Findings indicate that childhood EF skills are best conceptualized as a constellation of interconnected yet distinguishable cognitive self-regulatory skills. Individual differences in certain domains of EF track meaningfully and in expected directions with emotional and behavioral adjustment indices. Externalizing behaviors, in particular, are associated with latent Working Memory and Verbal Fluency factors. 相似文献
87.
Carrie Bailey Kelsey Panfil Kimberly Kirkpatrick 《Journal of the experimental analysis of behavior》2021,116(3):279-299
The present experiments investigated properties of time-based interventions used to increase self-control. Rats received impulsive-choice assessments before and after interventions that consisted of different distributions of delays to reinforcement. In Experiment 1, rats received an intervention with an increasing hazard function where delays were more evenly distributed, a decreasing hazard function where delays were mostly short, or a constant hazard function where delays were exponentially distributed. Surprisingly, rats that received the decreasing hazard function made the most self-controlled choices. Response rates during intervention trials showed that rats anticipated reinforcement based on the shape of the distributions they received. In Experiment 2, rats received an intervention with a decreasing hazard function with a steep slope or a shallow slope. Both time-based interventions increased self-control and produced similar response-rate patterns, indicating that the slope of the decreasing hazard function may not play a strong role in intervention efficacy. While this research aligns with previous literature showing that time-based interventions improved self-control, exposure to short delays produced the biggest improvements. Ultimately, exposure to short delays may increase the subjective value of the larger–later choice while occasional long delays may promote the ability to wait, which may have important implications for translational applications. 相似文献
88.
Smethells JR Fox AT Andrews JJ Reilly MP 《Journal of the experimental analysis of behavior》2012,97(2):203-214
Three experiments investigated the effects of immediate and delayed postsession feeding on progressive-ratio and variable-interval schedule performance in rats. During Experiments 1 and 2, immediate postsession feeding decreased the breakpoint, or largest completed ratio, under progressive-ratio schedules. Experiment 3 was conducted to extend the results of the first two experiments to responding maintained by variable-interval schedules with different session lengths (15 and 60 min). Response rates decreased in all 4 subjects when postsession feeding immediately followed a 15-min session and in 3 of 4 subjects when postsession feeding immediately followed a 60-min session. The implications of this research are twofold: (1) The functional context in which within-session reinforcers are embedded extends outside the experimental chamber, and (2) supplemental postsession feedings should be sufficiently delayed from the end of a session to avoid weakening operant behavior in the experimental sessions. 相似文献
89.
The construct of psychophysiological reactivity: Statistical and psychometric issues 总被引:1,自引:0,他引:1
The purpose of this paper is to review major statistical and psychometric issues impacting the study of psychophysiological reactivity and discuss their implications for applied developmental researchers. We first cover traditional approaches such as the observed difference score (DS) and the observed residual score (RS), including a review of classic and recent research on their reliability and validity from two related bodies of work: the measurement of change and the Law of Initial Values. Second, we review several types of latent variable modeling in this context: latent difference score (LDS) models, latent residual score (LRS) models, latent state-trait (LST) models, and latent growth curve (LGC) models. Finally, we provide broad guidelines for applied researchers broken down by key stages of a psychophysiological project: study planning, data analysis, and reporting of results. Our recommendations highlight the need for (1) increased attention to the ubiquitous nature of measurement error in observed variables and the importance of employing latent variable models when possible, and (2) increased specification of theories relating to the construct of reactivity, especially in regards to the distinction between baseline arousal and change over time in broader systems of variables. 相似文献
90.
Kees-Jan Kan 《Intelligence》2011,39(5):292
On the one hand, the factors Gf and Gc in the Cattell-Horn-Carroll (CHC) model of intelligence are hypothesized to represent individual differences in unique psychological or biological capacities. On the other hand, they are interpreted as representing the theoretical variables fluid and crystallized intelligence in investment theory. With respect to Gc, this leads to a theoretical conflict because in investment theory crystallized intelligence is not a capacity but purely a statistical entity. We contend that if CHC factor Gc represents a capacity, it cannot represent crystallized intelligence, and if Gc represents crystallized intelligence, it does not represent a capacity. In addition, from our discussion of Gc, we conclude that in investment theory the factors Gf and g represent one and the same capacity. In support of our theoretical conclusions, we implemented the CHC model in a confirmatory factor analysis of a HCA (Human Cognitive Abilities project) data set. As expected, Gf and g were statistically indistinguishable. Gc was effectively absent, because it was statistically equivalent to verbal comprehension. Factors Gc and g could be removed from the model without any reduction in model fit. We argue that in the CHC taxonomy the factors Gc and g are redundant as explanatory variables. 相似文献