On accelerating sequential procedures for estimating exponential populations

In this study, we accelerate the purely sequential procedure due to Anscombe(1953), Chow and Robbins(1965) to reduce the number of sampling operations required to carry out the estimation process. The method is proposed while estimating the location parameter(s) of the exponential distribution(s). We also develop theory for the asymptotic characteristic of the associated stopping variables. Our findings are applicable to both point as well as confidence interval estimation problems. Other interesting results are also given.     

Robust statistics for testing equality of means or variances

For testing the equality of means (location parameters) of two populations, Tiku (1980a) defined a statistic Tc (based on symmetrically censored samples) and showed that this statistic is robust to underlying populations and is also remarkably powerful. In this paper, we define a similar statistic T (based on samples s with observations censored only on one side) and show that this stat is tic is more powerful than T and nonparametric statistics, C for skew populations. We also provide a modification of this statistic for testing the equality of two population variances.     

Infant feeding and post-neonatal mortality in Derbyshire,England, in the early twentieth century

This paper examines influences on post-neonatal mortality in Derbyshire (England) in the early twentieth century, by applying multivariate hazard analysis to a rare individual-level data set. The data allow detailed patterns of breastfeeding and weaning to be examined. The role of feeding is given special attention as a mediator between mortality and the other environmental, social, and demographic factors considered. Twins and illegitimate children were more likely to have been hand-fed, but this could explain only a small fraction of their increased vulnerability. Artificial feeding was associated with increased risks of death from diarrhoea, respiratory disease, and wasting diseases. It is suggested that the link with wasting diseases was predominantly the result of the greater likelihood of congenitally weak children being hand-fed. Most of the variation in post-neonatal mortality, particularly from respiratory disease, was explained by environmental influences - population density, altitude, and the presence of mining.     

尼采:一个奇特的大人物——为纪念尼采逝世100周年而作

作为一位在哲学史上跨时代的哲学大家 ,尼采以其特有的睿智、敏感、热情和勇气对人生价值和道德问题给予了极其严肃的关注 :重估一切价值 ,成了尼采为之奋斗一生的目标 ;进行道德重估 ,则构成了尼采重估一切价值尝试中最为恢宏的工程     

Higher order local unbiasedness with computer algebra

Unbiased estimation methods that are in some way local on the parameter space have been initiated by Barankin (1948) and Fraser (1964). The later methods involving local unbiasedness are extended to higher (derivative or difference) order at a parameter value (θ) and provide a basis for a computer algebra implementation concerning the improvement of unbiased estimates.     

Estimation in High-Dimensional Analysis and Multivariate Linear Models

This article presents a new approach of estimating the parameters describing the mean structure in the Growth Curve model when the number of variables compared with the number of observations is large. An unbiased, consistent, and asymptotic normal estimator is derived as well as its.     

On the inferential use of predictive sample reuse

The predicitive sample reuse (PSR) data analysis technique proposed by Geisser and Eddy (1979) is applied to the analysis of categorical data. This application yiclds a new approach which has a number of advantages over classical methods for analysis of such data. A PSR technique for comparing linear or nonlinar regressino relationships, for two or more populations, and a PSR ailernative to certain nonparaemetri statistical tesis are also proposed.     

A new behavioural model for fertility schedules

Modelling age-specific fertility rates is of great importance in demography because of their influence on population growth. Although we have a variety of fertility models in the demographic literature, most of them do not have any demographic interpretation for their parameters. It is generally expected that models with behavioural interpretation are more universal than those without any interpretation. Even though the famous Gompertz model has some behavioural interpretation it suffers from other drawbacks. In the present work, we propose a new fertility model, which has its genesis in the generalization of logistic law. The proposed model has good behavioural interpretation, alongside having nice parameter interpretations.     

Adaptive estimation of the center of symmetry based on the empirical characteristic function

A procedure based on the empirical characteristic function is proposed for the estimation of the center of symmetric distributions. The method is an adaptive modification of the procedure proposed by Koutrouvelis (1985). The asymptotic behavior of the resulting estimator is investigated and finite sample comparisons are made with the previous nonadaptive estimator and an adaptive trimmed mean proposed by Hogg (1974).     

Least Absolute Regression Revisited

We describe a method for fitting a least absolute residual (LAR) line through a set of two–dimensional points. The algorithm is based on a labeling technique derived from linear programming. It is suited for interactive data analysis and can be carried out with graph paper and a programmable hand calculator. Tests conducted with a Pascal program indicate that the algorithm is computationally efficient.