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排序方式: 共有188条查询结果,搜索用时 78 毫秒
81.
David I. Kertzer Michael J. White Laura Bernardi Giuseppe Gabrielli 《Revue europeenne de demographie》2009,25(1):89-115
The deep drop of the fertility rate in Italy to among the lowest in the world challenges contemporary theories of childbearing
and family building. Among high-income countries, Italy was presumed to have characteristics of family values and female labor
force participation that would favor higher fertility than its European neighbors to the north. We test competing economic
and cultural explanations, drawing on new nationally representative, longitudinal data to examine first union, first birth,
and second birth. Our event history analysis finds some support for economic determinants of family formation and fertility,
but the clear importance of regional differences and of secularization suggests that such an explanation is at best incomplete
and that cultural and ideational factors must be considered. 相似文献
82.
Maximum likelihood estimation of a spatial model typically requires a sizeable computational capacity, even in relatively small samples, and becomes unfeasible in very large datasets. The unilateral approximation approach to spatial model estimation (suggested in Besag 1974) provides a viable alternative to maximum likelihood estimation that reduces substantially the computing time and the storage required. In this article, we extend the method, originally proposed for conditionally specified processes, to simultaneous and to general bilateral spatial processes over rectangular lattices. We prove the estimators’ consistency and study their finite-sample properties via Monte Carlo simulations. 相似文献
83.
Giuseppe Moscarini Lones Smith 《Econometrica : journal of the Econometric Society》2002,70(6):2351-2366
An unresolved problem in Bayesian decision theory is how to value and price information. This paper resolves both problems assuming inexpensive information. Building on Large Deviation Theory, we produce a generically complete asymptotic order on samples of i.i.d. signals in finite–state, finite–action models. Computing the marginal value of an additional signal, we find it is eventually exponentially falling in quantity, and higher for lower quality signals. We provide a precise formula for the information demand, valid at low prices: asymptotically a constant times the log price, and falling in the signal quality for a given price. 相似文献
84.
Rosita A. Condorelli Aldo E. Calogero Maurizio Di Mauro Laura M. Mongioì Giorgio I. Russo Giuseppe Morgia 《The aging male》2016,19(3):155-160
Purpose: To investigate a possible relation between penile Doppler ultrasound examination (PDUE) parameters and efficacy of chronic therapy with tadalafil (TAD) combined with a protocol of aerobic physical activity (PA) in patients with late onset hypogonadism (LOH). Methods: The study evaluated 30 patients consecutively enrolled with LOH and erectile dysfunction which present contraindication to hormonal replacement therapy for concomitant prostate disease. These patients were subjected to a combined protocol with phosphodiesterase V selective inhibitors (TAD 5?mg daily) and aerobic PA.Results: After three months, we observed significant improvements in erectile function [IIEF-5, median (IQR)?=?13.0 (7.0–18.0) versus 6.0 (5.0–6.75); p?0.01] and of the main metabolic [homeostatic model assessment index, median (IQR)?=?2.5 (1.62–3.37) versus 3.0 (2.0–3.75); p?0.01; body mass index, median (IQR)?=?27.0 (24.0–28.75) versus 27.5 (24.0–29.5)] and vascular parameters [peak systolic velocity, median (IQR)?=?29.5 (24.25–31.0) versus 28.0 (23.0–24.25); acceleration time, median (IQR)?=?114 (105.25–134.0) versus 115.0 (106.5–134.0)], assessed by PDUE.Conclusion: PA in association with phosphodiesterase V inhibitors could compensate the effects of hypogonadism on erectile function and facilitate the clinical response to these drugs even in the absence of adequate serum concentrations of total testosterone. 相似文献
85.
A universal generator for integer-valued square-integrable random variables is introduced. The generator relies on a rejection technique based on a generalization of the inversion formula for integer-valued random variables. This approach allows to create a dominating probability function, whose evaluation solely involves two integrals depending on the characteristic function of the random variable to be generated. The proposal gives rise to a simple algorithm which may be implemented in a few code lines and which may show good performance when the classical families of distributions—such as the Poisson and the Binomial—are considered. In addition, applications to the Poisson-Tweedie and the Luria-Delbrück distributions are provided. 相似文献
86.
87.
The application of technology, such as interactive digital whiteboards, in the online environment of higher education, is growing at an accelerated pace. Much is known about the tools used in an on-ground course to promote student engagement, but the literature is scant on tools to promote student engagement in the online environment. The purpose of this study is to explore qualitative data from students on faculty efforts to promote student engagement through leveraged digital whiteboard technology. A qualitative review of feedback from graduate students (n = 81) qualitative responses from open-ended questions and follow up online focus group sessions (n = 9) indicate that this technology can be useful to promote a sense of social engagement among students. It is expected that this knowledge will help instructors to better understand what promotes student engagement in an online graduate social work cohort. This learning tool can be used to promote further engagement in future assignments. 相似文献
88.
The structure of knowledge systems is a crucial component of the effort to make these systems effective and acceptable to users. This paper argues that the structure must correspond with the nature of knowledge, as the externalization of cognitive phenomena, in the form of intellectual nuggets that include topics, stories, concepts, and images. Lessons from the structuring of organizations suggest that the platform and the matrix approaches could be adopted in the design of knowledge systems. The paper then describes the advantages and limitations of these solutions. 相似文献
89.
We investigate the behavior of the well-known Hylleberg, Engle, Granger and Yoo (HEGY) regression-based seasonal unit root tests in cases where the driving shocks can display periodic nonstationary volatility and conditional heteroskedasticity. Our set up allows for periodic heteroskedasticity, nonstationary volatility and (seasonal) generalized autoregressive-conditional heteroskedasticity as special cases. We show that the limiting null distributions of the HEGY tests depend, in general, on nuisance parameters which derive from the underlying volatility process. Monte Carlo simulations show that the standard HEGY tests can be substantially oversized in the presence of such effects. As a consequence, we propose wild bootstrap implementations of the HEGY tests. Two possible wild bootstrap resampling schemes are discussed, both of which are shown to deliver asymptotically pivotal inference under our general conditions on the shocks. Simulation evidence is presented which suggests that our proposed bootstrap tests perform well in practice, largely correcting the size problems seen with the standard HEGY tests even under extreme patterns of heteroskedasticity, yet not losing finite sample relative to the standard HEGY tests. 相似文献
90.
DeSimone Steven D’Onza Giuseppe Sarens Gerrit 《Journal of Management and Governance》2021,25(2):561-591
Journal of Management and Governance - While an increasing number of organizations are engaging in sustainability activities, assurance of these activities is relatively new. We investigate the... 相似文献