Selection buasubg parameters in adaptive ridge regression estimators

Strawderman's family of regression estimators is considered. The choice of the scalars wbich characterize the biasing parameter is studied by obtaining the bias vector and the mean squared error matrix.     

Performance of nonparametric multiple comparison tests under heteroscedasticity,dependency, and skewed error distribution

In this article, an extensive Monte Carlo simulation study is conducted to evaluate and compare nonparametric multiple comparison tests under violations of classical analysis of variance assumptions. Simulation space of the Monte Carlo study is composed of 288 different combinations of balanced and unbalanced sample sizes, number of groups, treatment effects, various levels of heterogeneity of variances, dependence between subgroup levels, and skewed error distributions under the single factor experimental design. By this large simulation space, we present a detailed analysis of effects of the violations of assumptions on the performance of nonparametric multiple comparison tests in terms of three error and four power measures. Observations of this study are beneficial to decide the optimal nonparametric test according to requirements and conditions of undertaken experiments. When some of the assumptions of analysis of variance are violated and number of groups is small, use of stepwise Steel-Dwass procedure with Holm's approach is appropriate to control type I error at a desired level. Dunn's method should be employed for greater number of groups. When subgroups are unbalanced and number of groups is small, Nemenyi's procedure with Duncan's approach produces high power values. Conover's procedure successfully provides high power values with a small number of unbalanced groups or with a greater number of balanced or unbalanced groups. At the same time, Conover's procedure is unable to control type I error rates.     

Computation of standard errors in seemingly unrelated regression equation models

In a seemingly unrelated regression equation model, the feasible generalized least squares estimators are used for estimating the coefficients. In this paper, the standard errors associated with these estimators are obtained.     

The coefficient of determination and its adjusted version in linear regression models

This article presents a comparative study of the efficiency properties of the coefficient of determination and its adjusted version in linear regression models when disturbances are not necessarily normal.     

A Collaboratively Designed Child Mental Health Service Model: Multiple Family Groups for Urban Children with Conduct Difficulties

This paper presents preliminary outcomes associated with an experimental, longitudinal study of a Multiple Family Group (MFG) service delivery approach set within thirteen urban outpatient clinics serving children and their families living in inner-city, primarily African American and Latino communities. Specifically, this paper focuses on parent reports of child oppositional behavior and parenting stress over time. MFG is a flexible, protocol-driven approach designed to address the most common reason for referral to outpatient child mental health clinics, childhood behavioral difficulties. The MFG also aims to enhance family-level engagement and retention in ongoing care. Further, the service delivery model was collaboratively developed with intensive input from parents rearing children with conduct difficulties, parent advocates, community-based child mental health providers and services research staff in order to ultimately expand the number of effective service models that can be situated within "real world," urban child mental health settings.     

The new German citizenship law and its impact on German demographics: research notes

The processes of marginalization and inclusion of immigrants vary widely among industrialized welfare states. Models of citizenship, as a mechanism of both inclusion and exclusion, shape, to a large degree, the outcome of these processes. They affect the way immigrant and ethnic groups identify themselves within the mainstream society. This research note discusses whether or not institutional approaches to naturalization developed in the United States apply to the German case in the wake of the German citizenship reform of 1999. It also demonstrates how the introduction of birthright citizenship has caused a dramatic change in such demographic trends as the number of births to immigrants at both the federal and local levels. Berlin will provide the context at the local level for the impact of the citizenship reform on local official statistics.     

The Changing Face of Distribution Channels: Partial Forward Integration and Strategic Investments

Recent years have seen a drastic transformation in the organization of wholesale and retail markets. Where once clear distinctions between wholesale suppliers and retail competitors existed, now an era of blurring boundaries has emerged. This transformation has been marked by the introduction of online channels for suppliers to provide products directly to consumers while, at the same time, traditional retailers too persist. Thus, retailers are both wholesale customers and retail competitors of many manufacturers. The consequences of the rapid emergence of instances of such partial forward integration by suppliers are not yet fully known. To this end, we study how partial forward integration can affect competing firms' strategic investments. We find that integration shifts the environment from being one in which firms invest to undercut retail rivals to one in which firms invest more in boosting demand, even that of their competitors. A case in point is the tendency for a manufacturer to invest broadly in brand promotion (benefiting both itself and its retail competitor), rather than heavy promotion of its own sales channel. The shift in the nature of strategic investments arising from partial forward integration implies that such integration can benefit firms and consumers alike, even the firm which finds itself reliant on a competitor for supplies.     

Valuing an East European Company

Investors in many parts of the world are considering opportunities in transitional economies, but such investments typically require analyses that are different from those performed in mature, market-based economies. This article evaluates the application of traditional firm valuation procedures to state-owned enterprises in the former Soviet bloc countries. The valuation problems faced by the foreign joint venture partner extend beyond those posed by an absence of capital market prices and a lack of useful managerial data in the socialist-styled financial statements. A more fundamental problem arises from the deteriorated condition of the assets of most of these firms. Years of underinvestment and neglect have eroded the worth of assets so that firm value is driven by future growth opportunities rather than currently profitable assets. Based on extensive interviews with participants and using both socialist and western-compatible financial statements, we illustrate the difficulties in obtaining valuation estimates through the example of a Czech metals manufacturer. Given the importance of growth opportunities, we recommend that valuation be undertaken with active participation of insiders, instead of a mechanical task done by outside consultants alone.     

Do you feel like an insider? Job security and preferences for Flexibilization across Europe

The paper analyses the determinants of public opinion on flexibilisation of work contracts. While the literature on new labour market divides has rapidly expanded, few contributions directly look at employees’ demands for labour market regulation. By using a multi-level data set for 25 European countries, we find that the subjectively assessed job security is an important and valuable predictor of preferences for flexibilisation. In particular, those with very low and very high levels of perceived job security prefer flexibilisation compared to those with medium levels. We also show that the effect is stronger in countries with stricter employment protection legislation. The findings contribute to the literature on new divides of labour market politics in several ways. First, our empirical operationalization is related directly to the core of insider-outsider theory, the protection of work contracts. Second, subjective assessment of employment security yields important complementary insights into a debate usually focusing on objective measures. Third, we find that the (subjective) divide is context dependent; it is much more visible in countries where employment protection regulation is strong.