A Dynamic Approach to the Determinants of Immigrants’ Language Proficiency: The United States, 1980–20001

This article proposes a dynamic perspective on immigrants’ language proficiency. Hypotheses are formulated about immigrants’ language skills at arrival and about the speed with which immigrants learn the language thereafter. It pools data from the 1980, 1990, and 2000 U.S. Censuses, and uses a synthetic cohort design to analyze the language skills of immigrants within the first 20 years after migration. Multilevel models show that higher educated immigrants arrive with better language skills and learn the language quicker. Group size has a double‐negative effect: it attracts less skilled immigrants, and it hampers language learning. These and other determinants are discussed in light of current research on immigrants’ second‐language proficiency.     

Fertiliser Subsidies and Social Cash Transfers as Complementary or Competing Instruments for Reducing Vulnerability to Hunger: The Case of Malawi

Fertiliser subsidies and social transfers are complementary instruments for reducing vulnerability to hunger in poor agrarian countries. The former act on production and aim to reduce food insecurity through yield growth, while the latter tackle food‐entitlement failures directly, by providing either food itself or the cash to purchase food to selected beneficiaries. The policies compete for scarce public resources, and each represents an ‘opportunity cost’ compared to the other. Using Malawi to illustrate these comparisons, this article shows that a mix of policies can be affordable, allowing for strategic choice over the portfolio most likely to achieve a reliable consumption floor for the most vulnerable rural people.     

Australian child protection services: A game without end

Hansen P, Ainsworth F. Australian child protection services: A game without end This article argues that Australian child protection services are based on an error of logical typing. Across time, this has led to an over‐reliance on mandatory reporting legislation, a forensic/investigative/prosecutorial model of practice, a risk‐averse organisational culture and zero tolerance of any imperfections in parenting practices which are defined as child abuse and neglect regardless of their severity. All of these positions ignore powerful social stressors that surround complex family situations where abuse and neglect can occur. It is proposed that this error of logical typing is confirmed by the well‐documented fact that Australian child protection services have for more than two decades been unable to prevent or reduce the incidence of child abuse and neglect. For this article, New South Wales is used as the exemplar state.     

Ethnic Discrimination in Recruitment and Decision Makers’ Features: Evidence from Laboratory Experiment and Survey Data using a Student Sample

This article examines which individual-level factors are related to people’s likelihood of discriminating against ethnic minority job applicants. It moves beyond describing to what extent discrimination occurs by examining the role of individuals’ interethnic contacts, education and religion in shaping their behavior towards ethnic minority job applicants. We derive expectations from theories from the interethnic attitudes literature. Data are collected via (1) a laboratory experiment in which student participants (n = 272) reviewed résumés of fictitious applicants who varied regarding ethnicity, gender, education and work experience and (2) a survey amongst the same participants. During the experiment, participants assess applicants’ suitability for a job and select applicants for an interview. Additionally, participants complete a questionnaire including questions on several personal and background features. Results show that individuals who have more positive interethnic contacts, higher educational levels and higher educated parents are less likely to discriminate against ethnic minority applicants. Individuals whose parents are church members are more likely to discriminate, as are males. We find interesting differences regarding the role of decision makers’ features between different stages of the recruitment process. First assessments of applicants’ suitability for a job are predominantly affected by applicants’ features. Differences between decision makers here are relatively small. Eventual choices about which applicants to invite for a job interview, however, are affected by both applicants’ and decision makers’ features; here differences between decision makers are more pronounced. Theoretical implications of these findings are discussed.     

On the Asymptotic Sizes of Subset Anderson–Rubin and Lagrange Multiplier Tests in Linear Instrumental Variables Regression

We consider tests of a simple null hypothesis on a subset of the coefficients of the exogenous and endogenous regressors in a single‐equation linear instrumental variables regression model with potentially weak identification. Existing methods of subset inference (i) rely on the assumption that the parameters not under test are strongly identified, or (ii) are based on projection‐type arguments. We show that, under homoskedasticity, the subset Anderson and Rubin (1949) test that replaces unknown parameters by limited information maximum likelihood estimates has correct asymptotic size without imposing additional identification assumptions, but that the corresponding subset Lagrange multiplier test is size distorted asymptotically.     

Der Anwendungsbereich der Sharpe Ratio als Performancema? ist gr??er, als viele vermuten

The best-known performance measure is the Sharpe ratio. During the last two decades, many alternatives to the Sharpe ratio have been proposed. A common argument for using an alternative reward-to-risk ratio is the presence of asymmetry and fat tails in returns. This papers points out that this argument is problematic. In fact, in order to reject the Sharpe ratio as a performance measure one has to reject the hypotheses that the funds?? returns satisfy the location and scale property (see Sinn. Economic Decisions Under Uncertainty, 2?Aufl. Amsterdam, 1983; Meyer. American Economic Review 77:421?C430, 1987) or it generalization (see Meyer and Rasche. The Economic Journal 102(410):91?C106, 1992). This shows that the Sharpe ratio is better than many people think. Use of the Sharpe ratio is justified even in the presence of asymmetry and fat tails.     

The One-Box Challenge: Providing a Federated Search That Benefits the Research Process

The one-box federated search of databases brings as many challenges as promises to database searching, especially in terms of adapting these systems to user needs and the effects this new mode of searching will have on users' research behaviors. This issue of “The Balance Point” presents several librarians with strong interests in reference and instruction, who tell the story of adapting a federated search system for their libraries and reflect upon how federated searching can change the way students do research and on the implications federated searching has on information literacy skills and the quality of results found.     

Degradable systems:a survey of multistate system theory

The vast majority of reliability analyses assume that ccmponents and system are in either of two states: functioning or failed. However, in many real life situations we are actually able to distinguish among various 'Ilevels of performance" for both system and components. For such situations, the existing dichotomous model is a gross oversimplification and so models assuming degradable (multistate) systems and components are preferable since they are closer to reality.We present a survey of recent papers which treat the more I sophisticated and more realistic models in which components and systems may assume many states ranging from perfect functioning to complete failure. Our survey updates and complements a previous survey by El-Neweihi and Proschan (1980). Some new results are included.     

Contributors to a multivariate statistical process control chart signal

A significant practical disadvantage of multivariate statistical process control is that it is difficult to determine which of the monitored variables is responsible for the out-of-control signal. While there have been several proposed techniques and diagnostics, most of these have disadvantages. Rather than an ad hoc selection, we use three approaches to develop a diagnostic for a chi-square chart and generate the same statistic from each approach. Consequently, intuitive interpretations of the diagnostic are provided and previous proposals are simplified by a focus on a single metric.     

Age,Trend, and Cohort Effects in a Macro Model of Canadian Expenditure Patterns

A quadratic almost ideal demand system allowing for age, cohort, and trend effects is developed at the macro level. The model is estimated by maximum likelihood, using a three-tier iterative/search method applied to pooled 1961–1992 time series for five regions of Canada and six categories of expenditure. Hypothesis tests indicate support for the model specification. Elasticities are compared with those reported in other studies, with special attention to food. Effects of demographic and trend variables on elasticities and expenditure shares are investigated. An overall conclusion is that such effects can be very important in a macro demand system.