On testing hypotheses with divergence statistics

Using divergence measures based on entropy functions, a procedure to test statistical hypotheses is proposed. Replacing the parameters by suitable estimators in the expresion of the divergence measure, the test statistics are obtained. Asymptotic distributions for these statistics are given in several cases when maximum likelihood estimators are considered, so they can be used to construct confidence intervals and to test statistical hypotheses based on one or more samples. These results can also be applied to multinomial populations. Tests of goodness of fit and tests of homogeneity can be constructed.     

Feasibility study for collecting alcohol and other drug use data among secondary school students: a web-based survey approach

This study examined the feasibility of using a Web-based survey to collect alcohol and other drug use data from secondary school students in an urban school district in the Midwest. A Web-based survey was self-administered by a random sample of 6th through 11th grade students in the spring of 2002. The final sample consisted of 1,536 secondary school students (781 women and 755 men). The sample was 57% White, 40% African American, and 3% from other racial and ethnic groups. Several indicators of data quality were examined including response rate, absenteeism, refusals, substantive data, and data processing time. The study achieved a response rate of 89.1%. The results of the present study provide evidence that a Web-based survey can be successfully implemented in an economically and racially diverse urban sample of secondary students. While researchers conducting survey research within secondary schools should consider using Web-based survey approaches, additional research is needed to compare Web-based surveys to more traditional approaches to collecting data.     

Some issues related to the topological aggregation of preferences: addendum

 The purpose of this addendum is to correct some results published in our paper “Some issues related to the topological aggregation of preferences” (SCW (1992) 9: 213–227). Received: 28 November 1992/Accepted: 22 April 1996     

Differences in Decision-Making Capacity Among Mexican Women of Different Ages

Population Research and Policy Review - Women born in different years have been exposed to different experiences, circumstances, and contexts. Therefore, the expected effects of socioeconomic...     

A multidimensional employment quality index for Brazil, 2002–11

In countries where informal, insecure jobs are widespread, traditional labour market indicators – such as the unemployment rate, labour force participation rate and wages – are not necessarily the most meaningful. The authors use a multidimensional employment quality index to analyse the Brazilian labour market over the period 2002–11, across three dimensions: earnings, formality (measured by the existence of an employment contract and social security contributions) and job tenure. The results show a significant increase in employment quality overall, especially in the years 2009–11, but with considerable differences between wage employees and self‐employed workers, and between industries.     

Parental Provision of Academic Structure and the Transition to Middle School

This study examined parents' provision of academic structure, and whether they implement it in an autonomy supportive or controlling manner, in relation to children's competence‐related beliefs, motivation, and academic behavior over the transition to middle school. Interviews with 160 sixth‐grade children were coded on parental structure and autonomy support. Children reported on their competence‐related beliefs, motivation, and engagement in sixth and seventh grades. Regression analyses showed that higher structure predicted seventh‐grade perceived competence, intrinsic motivation, engagement, and English grades, controlling for these same outcomes at sixth grade. Autonomy support predicted perceived competence, autonomous motivation, and English grades, controlling for prior outcomes. Structural equation models indicated that relations between structure and engagement and between autonomy support and grades were mediated by perceived competence.     

Information theoretic methods in small domain estimation

Small area estimation techniques are becoming increasingly used in survey applications to provide estimates for local areas of interest. The objective of this article is to develop and apply Information Theoretic (IT)-based formulations to estimate small area business and trade statistics. More specifically, we propose a Generalized Maximum Entropy (GME) approach to the problem of small area estimation that exploits auxiliary information relating to other known variables on the population and adjusts for consistency and additivity. The GME formulations, combining information from the sample together with out-of-sample aggregates of the population of interest, can be particularly useful in the context of small area estimation, for both direct and model-based estimators, since they do not require strong distributional assumptions on the disturbances. The performance of the proposed IT formulations is illustrated through real and simulated datasets.     

On the Internal Structure of Cities

We prove the existence of a symmetric equilibrium in a circular city in which businesses and housing can both be located anywhere in the city. In this equilibrium, firms balance the external benefits from locating near other producers against the costs of longer commutes for workers. An equilibrium city need not take the form of a central business district surrounded by a residential area. We propose a general algorithm for constructing equilibria, and use it to study the way land use is affected by changes in the model's underlying parameters.