An L-statistic approach to a test of exponentiality against IFR alternatives

In this note we consider the problem of testing exponentiality against IFR alternatives. A measure of deviation from exponentiality is developed and a test statistic constructed on the basis of this measure. It is shown that the test statistic is an L-statistic. The asymptotic as well as the exact distribution of the test statistic is obtained and the test is shown to be consistent.     

Estimation of Pr(Y < X) for the two-parameter generalized exponential records

This article considers the maximum likelihood and Bayes estimation of the stress–strength reliability based on two-parameter generalized exponential records. Here, we extend the results of Baklizi [Computational Statistics and Data Analysis 52 (2008), 3468–3473] to explain a wide variety of real datasets. We also consider the estimation of R when the same shape parameter is known. The results for exponential distribution can be obtained as a special case with different scale parameters.     

地方性大学的学术理念与学术导向--评《怀化学院学报》的"民族文化研究"专栏

怀化学院学报编辑部为了使苗、侗、土家、瑶、白等民族的本土文化研究的成果及时地向学术界和社会推介,不失时机地在学报开设了"民族文化研究"栏目.栏目的创办是学报办刊创新思路的体现,是学报编辑部根据学校办学和学科特点而精心策划而成为办刊的宗旨."民族文化研究"栏目的开设使得怀化学院学报有了自己的主打栏目,这一特色栏目构成了怀化学院学报期刊品牌的骨架,展示着该学报的气魄与亮点,是学报吸引读者的招牌.怀化学院学报的优势、品味、层次和风格便从期刊的特色栏目中体现出来.     

The L2 Rate of Convergence for Event History Regression with Time-dependent Covariates

Consider repeated events of multiple kinds that occur according to a right-continuous semi-Markov process whose transition rates are influenced by one or more time-dependent covariates. The logarithms of the intensities of the transitions from one state to another are modelled as members of a linear function space, which may be finite- or infinite-dimensional. Maximum likelihood estimates are used, where the maximizations are taken over suitably chosen finite-dimensional approximating spaces. It is shown that the L ₂ rates of convergence of the maximum likelihood estimates are determined by the approximation power and dimension of the approximating spaces. The theory is applied to a functional ANOVA model, where the logarithms of the intensities are approximated by functions having the form of a specified sum of a constant term, main effects (functions of one variable), and interaction terms (functions of two or more variables). It is shown that the curse of dimensionality can be ameliorated if only main effects and low-order interactions are considered in functional ANOVA models.     

New statistical needs concerning the estimation of the demographic changes taking place in Poland

The authors examine the increased need for survey data in Poland to keep track of the rapid economic, social, and demographic changes that are occurring in the country. They discuss the type of surveys that are needed and such topics as data compatibility, sampling, frequency, and organization of data collection through surveys. (ANNOTATION)     

Demographic changes in the seaside voivodships

"The context of this issue is the population changes in the coastal regions of Poland during the transformation of the state. Detailed analysis concerns the following years: 1985, 1990, 1995. The population state in these 5 regions...was quite different in comparison with other regions. The northern part of Poland is influenced by a relatively high [population] dynamics." (EXCERPT)     

Economic and demographic effects on working women in Latin America

The paper uses historical census data and the latest household surveys to investigate the evolution of female employment in Latin America, the effect of demographic factors on female labor force participation, and the reasons for the observed male-female gap in labor earnings. The findings show that, though women's labor force participation in Latin America has indeed increased despite the adverse economic conditions of the last two decades, marriage and fertility still exercise a large negative effect on women's labor supply. On average in the 15 countries studied, marriage reduces the probability that a woman would work by half, and each child by a further 3–5% These effects result in age-participation profiles that decrease with age although the econometric analysis suggests that, as women get older, they have a ceteris paribus greater probability to seek employment. In all the countries studied women are rewarded less than men and gender differences in human capital characteristics cannot account for the observed earnings differential. The paper discusses the significance of the findings for potential policies to assist women, especially in the areas of education and fertility, and also suggests the direction of further reserarch.The views expressed here are those of the authors and should not be attributed to the World Bank and its affiliated organisations.     

The demographic situation as a factor in emigration from the USSR

This is an analysis of recent trends in internal migration within and emigration from the former Soviet Union. The study focuses on domestic social tensions and interethnic conflicts affecting migration. The author concludes that continued growth of the rural population, particularly in Central Asia, combined with growing unemployment, declining living standards, and economic stagnation will mean that Russia will have to repatriate a considerable proportion of Russians from other republics. Consideration is also given to a predicted demand for immigration from the non-Russian population of Central Asia. This is a translation of a Russian article in "Migratsiia naseleniia", Moscow, Russia, Russian Academy of Sciences, 1992, pp. 6-31.     

Time-management strategies used by households with home-based work

A sample of 899 households in which at least one member is engaged in home-based work is used to analyze two time-management strategies used to respond to the demands of home-based work. Analyses reveal that, first, personal time is reallocated more than additional help is obtained for either the home-based work or household production and, second, that different strategies are used depending on whether the household manager is also the home-based worker. Respondents holding both roles report reallocating personal time more often than respondents who are not home-based workers; the reverse holds for obtaining additional help. The results suggest that households generating higher incomes in which home-based work is a full-time occupation are more likely to use time-management strategies than those in which incomes are lower and the home-based work is part-time.Journal Paper Number J-14861 Iowa Agriculture and Home Economics Experiment Station, Project Number 2857. This article reports results from the Cooperative Regional Research Project, NE-167, entitled, At-Home Income Generation: Impact on Management, Productivity and Stability in Rural and Urban Families, partially supported by the Cooperative States Research Service, U. S. Department of Agriculture, and the Experiment Stations at the University of Hawaii, Iowa State University, Lincoln University (Missouri), Michigan State University, Cornell University (New York), The Ohio State University, The Pennsylvania State University, Utah State University, and the University of Vermont. This article was accepted in 1992 under the editorship of Charles B. Hennon.Her current research work includes an analysis of family resource management in Mexico and of housing conditions in rural areas. She is also involved in the study of household members who work at home for pay and their associated management practices and coping strategies. She received her Ph.D. from The Pennsylvania State University in 1970.She received her M.S. from Iowa State University in May 1992. This paper is based on her M.S. thesis.Her current research interests include household asset and debt formation, working families and employers' benefits, and home-based employment. She received her Ph.D. from Purdue University in 1978.Her current research work includes such topics as divorce settlements, at-home income generation, and management practices of households engaged in home-based employment. Her Ph.D. degree was received from Cornell University in 1978.