Nonparametric estimation of conditional expectation

Denote the integer lattice points in the N  -dimensional Euclidean space by Z^N${\mathbb{Z}}^N$ and assume that (_Xi,_Yi)$(X_{\mathbf{i}},Y_{\mathbf{i}})$, i∈Z^N$\mathbf{i}\in {\mathbb{Z}}^N$ is a mixing random field. Estimators of the conditional expectation r(x)=E[_Yi|_Xi=x]$r(\mathbf{x})=\mathrm{E}[Y_{\mathbf{i}}|X_{\mathbf{i}}=\mathbf{x}]$ by nearest neighbor methods are established and investigated. The main analytical result of this study is that, under general mixing assumptions, the estimators considered are asymptotically normal. Many difficulties arise since points in higher dimensional space N?2$N?2$ cannot be linearly ordered. Our result applies to many situations where parametric methods cannot be adopted with confidence.     

Organic coasts? Regulatory challenges of certifying integrated shrimp–mangrove production systems in Vietnam

The Vietnamese government aims to expand the scale of Naturland certified organic production in integrated shrimp–mangrove farming systems across the coast of Ca Mau province by 2015. In doing so the division between public and private regulation has become blurred. We analyze the government's goal by examining the regulatory challenges of using organic certification as a means of linking farm-level management to the sustainability of coastal (mangrove) landscapes. The results show the importance of farmer perceptions of sustainable farm and landscape management, fair benefit sharing mechanisms in the certified value chain, and legitimate private sector-led auditing. We conclude that in order to overcome conflicts of interest and legitimate representation in organic certification, the social and economic conditions of production require regulatory intervention from provincial and local level government. To achieve benefits beyond the scale of the farm, the role of shrimp producers should be redefined as partners in rather than targets of regulation.     

The Organisational Culture of Vietnamese and Chinese Corporations: Do Age and Gender Make a Difference?

Public Organization Review - Globalisation has developed the requirement for superiors to manage worldwide organisations across cultures successfully. Comprehending and setting up proper...     

Street‐level discretion,emotional labour and welfare frontline staff at the Australian employment service providers

Despite the current controversial debates about discretion in public bureaucracies in general, and in welfare agencies in particular, the current literature on street‐level bureaucracy mainly assumes that discretion is a distinctive feature of the daily work of public servants. Nonetheless, a pertinent question has not specifically been asked in this literature, that is, given the context of privatisation and increased welfare conditionality in the welfare sector that are seriously challenging welfare frontline staff's commitment to social justice and human rights‐based practices, what are forms of street‐level discretion likely to contribute to improving the quality of welfare services? In this study, we attempt to address this question by exploring discretion displayed by welfare frontline staff in four Australian employment service providers. We argue that emotional labour, especially when being informed by critical empathy, is an important and effective form of street‐level discretion that welfare frontline workers can perform to better support welfare recipients and minimise the punitive aspects of welfare policy.     

Does greater household wealth make young children perform better? The case of Vietnam

Our study examines factors affecting children's cognitive ability in Vietnam for the period 2006–2016. We find that conditional wealth has a positive association with the cognitive capacity of 15-year-old children, manifested in all three methods of measurement: vocabulary points, math scores and reading comprehension scores in Vietnamese. Notably, the finding implies that improving household wealth after the children's first 1,000 days still plays an important role in the cognitive development of 5–12-year-olds. Also, it suggests that using conditional wealth enables us to capture the impact of economic shocks, thereby having a significant effect on the cognitive ability of children.     

Physiologically-Based Pharmacokinetic Modeling of Benzene in Humans: A Bayesian Approach

Benzene is myelotoxic and leukemogenic in humans exposed at high doses (>1 ppm, more definitely above 10 ppm) for extended periods. However, leukemia risks at lower exposures are uncertain. Benzene occurs widely in the work environment and also indoor air, but mostly below 1 ppm, so assessing the leukemia risks at these low concentrations is important. Here, we describe a human physiologically-based pharmacokinetic (PBPK) model that quantifies tissue doses of benzene and its key metabolites, benzene oxide, phenol, and hydroquinone after inhalation and oral exposures. The model was integrated into a statistical framework that acknowledges sources of variation due to inherent intra- and interindividual variation, measurement error, and other data collection issues. A primary contribution of this work is the estimation of population distributions of key PBPK model parameters. We hypothesized that observed interindividual variability in the dosimetry of benzene and its metabolites resulted primarily from known or estimated variability in key metabolic parameters and that a statistical PBPK model that explicitly included variability in only those metabolic parameters would sufficiently describe the observed variability. We then identified parameter distributions for the PBPK model to characterize observed variability through the use of Markov chain Monte Carlo analysis applied to two data sets. The identified parameter distributions described most of the observed variability, but variability in physiological parameters such as organ weights may also be helpful to faithfully predict the observed human-population variability in benzene dosimetry.     

For Better,For Worse: Life Satisfaction Consequences of Migration1

This study explores the extension of microeconomic and migrant network theoretical frameworks for explaining perceived post‐migration life satisfaction of repeat (temporary) and more permanent labor force internal migrants in Thailand. Data from the 1992 National Migration Survey were used in logistic regression models to predict increased versus decreased post‐move satisfaction with employment situation, living environment, and community facilities. Contrary to the neoclassical migration theory assumption, results showed that migration was associated with decreased post‐move satisfaction. Microeconomic theory indicators were related to increased employment satisfaction but decreased post‐move satisfaction with living environment. For network theory indicators, the results showed the opposite pattern — related to improved living environment satisfaction but decreased employment post‐move satisfaction. Repeat (temporary) migrants were disadvantaged in post‐move employment satisfaction compared to more permanent single move labor force migrants.     

Local asymptotic properties for Cox-Ingersoll-Ross process with discrete observations

In this paper, we consider a one-dimensional Cox-Ingersoll-Ross (CIR) process whose drift coefficient depends on unknown parameters. Considering the process discretely observed at high frequency, we prove the local asymptotic normality property in the subcritical case, the local asymptotic quadraticity in the critical case, and the local asymptotic mixed normality property in the supercritical case. To obtain these results, we use the Malliavin calculus techniques developed recently for CIR process together with the estimation for positive and negative polynomial moments of the CIR process. In this study, we require the same conditions of high frequency and infinite horizon as in the case of ergodic diffusions with globally Lipschitz coefficients studied earlier in the literature. However, in the non-ergodic cases, additional assumptions on the decreasing rate are required due to the fact that the square root diffusion coefficient of the CIR process is not regular enough.     

Asymptotic approximations to the gain of the 2shi over stein estimators in linear regression models when the disturbances are small

The paper considers a new family of explicit or fully operational two-stage Stein or hierarchial information (2SHI) estimators for linear regression models, and provides an expression for the difference between the risks of these estimators and the usual Stein-rule estimator when the variance of the disturbance is small. The condition under which the 2SHI estimators have smaller average MSE than the Stein-rule estimator is also given.     

Corporate Governance und Eigenkapitalkosten - Bestandsaufnahme des Schrifttums unter besonderer Ber��cksichtigung des Informationsaspektes und Forschungsperspektiven

The present paper provides an overview of research concerning the relationship between corporate governance and the cost of equity capital. The purpose is to explore whether and to what extent corporate governance attributes manifest in firms?? cost of capital. Since the separation of ownership and control is seen as the starting point for the academic thinking on this issue, the term of corporate governance from a shareholder perspective is discussed in more detail. Apart from this terminological discussion the emphasis of this paper lies on the critical review of theoretical and empirical literature. In conducting this review, empirical concepts measuring the relevant dimensions and their potential limitations are explained. Based on these limitations I suggest opportunities for expanding research on the relationship between corporate governance and cost of equity capital, thereby showing future research directions.