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11.
The class of affine LIBOR models is appealing since it satisfies three central requirements of interest rate modeling. It is arbitrage-free, interest rates are nonnegative, and caplet and swaption prices can be calculated analytically. In order to guarantee nonnegative interest rates affine LIBOR models are driven by nonnegative affine processes, a restriction that makes it hard to produce volatility smiles. We modify the affine LIBOR models in such a way that real-valued affine processes can be used without destroying the nonnegativity of interest rates. Numerical examples show that in this class of models, pronounced volatility smiles are possible. 相似文献
12.
In studying the complex determinants of human fertility, social scientists have given little attention to population density,
although reproduction has been shown to be density-dependent for a wide variety of other species. Using fixed effects models
on the time series of 145 countries and controlling for key social and economic variables, we find a consistent and significant
negative relationship between human fertility and population density. Moreover, we find that individual fertility preferences
also decline with population density. These findings suggest that population density should be included as a variable in future
studies of fertility determinants.
相似文献
Wolfgang LutzEmail: |
13.
David Bauder Rostyslav Bodnar Taras Bodnar Wolfgang Schmid 《Scandinavian Journal of Statistics》2019,46(3):802-830
In this paper, we consider the estimation of the three determining parameters of the efficient frontier, the expected return, and the variance of the global minimum variance portfolio and the slope parameter, from a Bayesian perspective. Their posterior distribution is derived by assigning the diffuse and the conjugate priors to the mean vector and the covariance matrix of the asset returns and is presented in terms of a stochastic representation. Furthermore, Bayesian estimates together with the standard uncertainties for all three parameters are provided, and their asymptotic distributions are established. All obtained findings are applied to real data, consisting of the returns on assets included into the S&P 500. The empirical properties of the efficient frontier are then examined in detail. 相似文献
14.
Wolfgang Hora Johanna Gast Norbert Kailer Andrea Rey-Marti Alicia Mas-Tur 《Review of Managerial Science》2018,12(2):411-439
Coopetition (collaboration between competitors) among young firms (i.e. start-ups) and larger, more established firms (i.e. corporates) may be beneficial for both partners as each party typically has something to offer that is missing in the other. Start-ups often develop innovative ideas, are flexible and agile, willing to take risks, and aspire to achieve high growth, but they tend to lack the required resources, capabilities, and knowledge due to their newness and smallness. Corporates have resources, routines, and experience that enable them to work efficiently but lack a certain innovation capability. Research has suggested that coopetition represents an opportunity for start-ups facing restrictions in resources, while corporates benefit from start-ups’ innovative ideas. However, it is yet unknown whether start-ups and corporates engage in coopetition with each other and, if so, how and why they do this. This study seeks to fill this void by exploring the motives of coopeting start-ups and corporates, how they manage their coopetitive relationship, and what implications occur including potential benefits and risks. We present a multiple case study based on qualitative data collected through 70 interviews with Austrian-based start-ups and corporates representing 35 coopetitive partnerships. Discussing the findings based on our data, we propose relationships concerning coopetition and its role to enlarge resource- and technology-bases as well as its role in the development of dynamic capabilities. 相似文献
15.
We focus on the construction of confidence corridors for multivariate nonparametric generalized quantile regression functions. This construction is based on asymptotic results for the maximal deviation between a suitable nonparametric estimator and the true function of interest, which follow after a series of approximation steps including a Bahadur representation, a new strong approximation theorem, and exponential tail inequalities for Gaussian random fields. As a byproduct we also obtain multivariate confidence corridors for the regression function in the classical mean regression. To deal with the problem of slowly decreasing error in coverage probability of the asymptotic confidence corridors, which results in meager coverage for small sample sizes, a simple bootstrap procedure is designed based on the leading term of the Bahadur representation. The finite-sample properties of both procedures are investigated by means of a simulation study and it is demonstrated that the bootstrap procedure considerably outperforms the asymptotic bands in terms of coverage accuracy. Finally, the bootstrap confidence corridors are used to study the efficacy of the National Supported Work Demonstration, which is a randomized employment enhancement program launched in the 1970s. This article has supplementary materials online. 相似文献
16.
In this paper, the focus is on sequential analysis of multivariate financial time series with heavy tails. The mean vector and the covariance matrix of multivariate non linear models are simultaneously monitored by modifying conventional control charts to identify structural changes in the data. The considered target process is a constant conditional correlation model (cf. Bollerslev, 1990), an extended constant conditional correlation model (cf. He and Teräsvirta, 2004), a dynamic conditional correlation model (cf. Engle, 2002), or a generalized dynamic conditional correlation model (cf. Capiello et al., 2006). For statistical surveillance we use control charts based on residuals. Further, the procedures are constructed for t-distribution. The detection speed of these charts is compared via Monte Carlo simulation. In the empirical study, the procedure with the best performance is applied to log-returns of the stock market indices FTSE and CAC. 相似文献
17.
18.
Wolfgang Lutz Jesús Crespo Cuaresma Mohammad Jalal Abbasi‐Shavazi 《Population and development review》2010,36(2):253-281
Reconstructions and projections of populations by age, sex, and educational attainment for 120 countries since 1970 are used to assess the global relationship between improvements in human capital and democracy. Democracy is measured by the Freedom House indicator of political rights. Similar to an earlier study on the effects of improving educational attainment on economic growth, the greater age detail of this new dataset resolves earlier ambiguities about the effect of improving education as assessed using a global set of national time series. The results show consistently strong effects of improving overall levels of educational attainment, of a narrowing gender gap in education, and of fertility declines and the subsequent changes in age structure on improvements in the democracy indicator. This global relationship is then applied to the Islamic Republic of Iran. Over the past two decades Iran has experienced the world's most rapid fertility decline associated with massive increases in female education. The results show that based on the experience of 120 countries since 1970, Iran has a high chance of significant movement toward more democracy over the following two decades. 相似文献
19.
温哥华作为公交系统非常完善和发达的城市,由TransLink负责地区公交规划运营、管理和融资,以及区域公交模型(RTM)的开发和应用.从模型产生的背景、模型构架和要素以及模型的标定进行阐述,并举例说明模型在温哥华城市公交规划项目中的具体应用,旨在为中国公共交通线网和运营模型的建立提供可借鉴的经验. 相似文献
20.
In this paper I give an account of the major welfare conceptsand social reporting concepts of the 1970s, 1980s and 1990s. Inconclusion I discuss possibilities and limits of social reporting today.Quality of life and qualitative growth were the welfare programs of the1970s. The next decade saw a trend to individualization, subjectivewell-being and plurality of life styles. In the last decade the qualityof society once more came into the forefront in concepts likesustainable development, human development and social capital. From thefar-reaching program of the social indicators movement socialreports are the most visible results in many countries whereas ambitiousplans like national goals accounting failed. In the 1980s we watched akind of dissolution by diffusion and in the 1990s a revival inseveral fields. Overall, the monitoring and enlightenment function stillis the most important contribution of social reporting but today on ahigher level of data, methods and international comparisons. 相似文献