A doubly restricted exponential dispersion model

In this paper, we propose and develop a doubly restricted exponential dispersion model, i.e. a varying dispersion generalized linear model with two sets of restrictions, a set of linear restrictions for the mean response, and at the same time, for another set of linear restrictions for the dispersion of the distribution. This model would be useful to consider several situations where it is necessary to control/analyze drug-doses, active effects in factorial experiments, mean-variance relationships, among other situations. A penalized likelihood function is proposed and developed in order to achieve the restricted parameters and to develop the inferential results. Several special cases from the literature are commented on. A simply restricted varying dispersion beta regression model is exemplified by means of real and simulated data. Satisfactory and promising results are found.     

Letter to the Editor

The aim of this letter to acknowledge of priority on calibration estimation. There are numerous studies on calibration estimation in literature. The studies on calibration estimation are reviewed and it is found out that an existing calibration estimator is reprocessed in the recent paper published by Nidhi et al. (2007 Nidhi, B. V. S. Sisodia, Subedar Singh, and Sanjay K. Singh. 2017. Calibration approach estimation of the mean in stratified sampling and stratified double sampling. Commun.Statist.Theor.Meth. 46 (10):4932–4942.[Taylor &; Francis Online], [Web of Science ®] , [Google Scholar]).     

Another generalization of the logarithmic series and the geometric distributions

A new generalization of the logarithmic series distribution is presented based on a generalized negative binomial distribution obtained from a generalized Poisson distribution compounded with the truncated gamma distribution. By length biasing this generalized log-series distribution, another generalized geometric distribution is uresented. For the generalized log-series distribution, maximum likelihood estimators are developed and an example is presented for illustration.     

Culture and gender allocation of tasks: source country characteristics and the division of non-market work among US immigrants

Review of Economics of the Household - There is a well-known gender difference in time allocation within the household, which has important implications for gender differences in labor market...     

Influence of form and timing of social support on parental outcomes of a child-maltreatment prevention program

This study examines how the form of social support (informal or formal) and the time frame at which it is provided (at the start or end of the program) influence parental outcomes on the “Apoyo Personal y Familiar” (APF) program for at-risk families showing inadequate child-rearing practices. A total of 496 parents participated, 247 parents referred by the municipal social services in the Autonomous Community of Castile and Leon (Spain), and 249 non-referred parents. Initial and final levels of use of and satisfaction with informal and formal support were used as predictors of change scores in self-rating measures of beliefs about child development, perceptions of the parental role and child-rearing practices, applying hierarchical linear regression analyses. Perceived use of and satisfaction with support explained around 22% to 49% of the change scores in the Nurturist belief as a simple view of child development, Couple agreement on educational matters, Permissive–neglectful practices and Coercion practices, after accounting for the variance due to risk status, financial situation and family structure variables. Informal support always has a positive impact irrespective of when the help is provided, whereas formal support only has a positive impact when applied at the start of the program. The adequate provision of social supports can be an efficient way to prevent child maltreatment by promoting changes in parental beliefs and practices related to at-risk parenting.     

On zero-distorted generalized geometric distribution

ABSTRACT

We propose a new generalized geometric distribution which permits inflation/deflation of the zero count probability and study some of its properties. We also present an actuarial application of this distribution and fit it to three datasets used by other researchers. It is observed that the proposed distribution fits reasonably well to these data. Further, in a regression setup, the performance of this distribution is studied vis–a–vis other competing distributions used for explaining variability in a response variable.     

The impact of childbirth on Spanish women’s decisions to leave the labor market

The present paper analyzes the effect of childbirth on Spanish women??s decisions to withdraw from paid work, defined here as the transition from employment to out of the labor force due to the requirements of household production. Decisions regarding fertility and labor market participation are interrelated and depend on individual and household characteristics, as well as external variables such as the availability of childcare services. We postulate that a female??s decision to leave the labor market is taken in a household context, and thus is the outcome which maximizes household welfare after taking into account the employment and earnings characteristics of all household members. We pay special attention to the effect of the male partner??s characteristics upon the female??s decision to withdraw from the labor market. Our empirical results show that in order to better define social and labor market policies on work and family reconciliation, increased attention should be paid to the job characteristics of males given their effect on the optimal assignment of tasks within the household following childbirth.     

Measuring the effect of spell recurrence on poverty dynamics—evidence from Spain

Accounting for the time individuals spend below the poverty line is an important dimension in order to design social policies to fight against poverty. The literature is currently aiming to construct a consistent aggregate measure of poverty over time that takes into account individual income lifetime profiles. It is however, far from clear which aspects of the specific patterns of poverty spells should be included. Using longitudinal data for Spain, this paper shows that the effect of spell recurrence on poverty dynamics is relevant. Poverty exit and re-entry rates vary not only with personal or household characteristics but also with spell accumulation and the duration of current and past spells. In general, our main findings support that an aggregate intertemporal poverty index should incorporate full individual poverty lifetime trajectories accounting for both poverty and non-poverty spell durations.     

A procedure for estimating the number of outliers

A new type of procedure for estimating the number of outliers in a sample is presented and compared with existing procedures. The probabilities of exact, under-, and overestimation with the different procedures are examined for two different contamination schemes.     

Acceptance Sampling Plans from Truncated Life Tests Based on the Generalized Birnbaum–Saunders Distribution

In this article, we develop acceptance sampling plans when the life test is truncated at a pre-fixed time. The minimum sample size necessary to ensure the specified median life is obtained by assuming that the lifetimes of the test units follow a generalized Birnbaum–Saunders distribution. The operating characteristic values of the sampling plans as well as producer's risk are presented. Two examples are also given to illustrate the procedure developed here, with one of them being based on a real data from software reliability.