A generalization of random vectors and a correlation theory for them - a trial (with discussions) 2

There are defined generalized generalized random vectors. This notion contains usual random vectors, some classical and generalized stochastic processes and certain generalizations of them. There is developped a theory of correlation on basis of a theory of linear prediction (approximation) for such rendom vectors which includes especially canonical correlations.     

The Bias in Price Elasticity Estimates Under Homothetic Separability: Implications for Analysis of Peak-Load Electricity Pricing

This article demonstrates that the assumption of a homothetically separable utility function places a priori restrictions on the parameters of the demand system. If these restrictions are unwarranted, an open question if they are not explicitly tested, they will lead to biased price elasticity estimates. In particular, we show that the uncompensated own-price elasticities must be smaller than the negative of the expenditure shares; that is, the price elasticity of peak electricity demand must be less than the negative of the share of expenditure devoted to peak electricity. This finding is probably not new to economists familiar with consumer demand analysis. Nevertheless, many recent studies of consumer demand for electricity under time-of-day rates explicitly impose this restriction. The resulting price elasticity estimates are usually quite large in absolute value (.5 to .8); but they are the product of restrictive a priori assumptions as well as information embodied in the sample data. The results of two analyses of time-of-day experiments, where the researchers imposed the untested assumption of homothetic separability, are examined more closely. We find that the reported price elasticities are strongly influenced by that a priori assumption. A Monte Carlo experiment demonstrates that using this model will lead to the reported price elasticities even if the consumption data are perfectly random with respect to price.     

Simulation of Infinitely Divisible Random Fields

Two methods to approximate infinitely divisible random fields are presented. The methods are based on approximating the kernel function in the spectral representation of such fields, leading to numerical integration of the respective integrals. Error bounds for the approximation error are derived and the approximations are used to simulate certain classes of infinitely divisible random fields.     

Friedhelm Neidhardt zum 70. Geburtstag (3. Januar 2004)

Ohne Zusammenfassung     

Adopted Adolescents' Preoccupation With Adoption: The Impact on Adoptive Family Relationships

This study examines the relationship between the intensity of adopted adolescents' thinking about their adoptions and their adoptive family relationships. Participants included 135 adopted adolescents involved in an ongoing study of openness in adoption. Adolescents who reported high levels of preoccupation with adoption reported greater alienation from their adoptive fathers than did adolescents who reported moderate or low levels of preoccupation. Adolescents with extremely high levels of preoccupation reported significantly higher levels of alienation and significantly lower levels of trust for their adoptive mothers and fathers than adolescents with extremely low levels of preoccupation. These findings, along with the divergences between adolescents' perceptions of dyadic and overall family relationships, are discussed in terms of how they relate to the process of adoptive identity exploration.     

The debate over low fertility in the popular press: A cross-national comparison, 1998–1999

Aspects of below-replacement fertility have long been debated among professional demographers. This paper describes the corresponding popular debate about low fertility by analyzing 437 newspaper and magazine articles from eleven developed countries during 1998 and 1999. Despite the diversity in the national debates due to different socioeconomic, political and demographic backgrounds, our study finds important commonalties in the way low fertility is debated: First, countries emphasize consequences and potential interventions rather than causes in their popular debates over low fertility. Second, our study reveals that the popular press discusses low fertility as a serious concern with mostly negative implications, despite the fact that many of the causes of low fertility are associated with social and economic progress. Third, the variety of issues and perspectives revealed in the popular debate, while cohesive in general ways, invites a role for demographers in informing an accurate public discussion of low fertility, which will help form the most appropriate policy outcomes.