Smoothing Spline Estimation for Partially Linear Single-index Models

In this article, the partially linear single-index models are discussed based on smoothing spline and average derivative estimation method. This proposed technique consists of two stages: one is to estimate the vector parameter in the linear part using the smoothing cubic spline method, simultaneously, obtaining the estimator of unknown single-index function; the other is to estimate the single-index coefficients in the single-index part by the using average derivative estimator procedure. Some simulated and real examples are presented to illustrate the performance of this method.     

A model of completed length of service

The measurement of labour turnover is important both because high turnover is regarded as a sign that something is wrong in a firm and also because quantitative information is important in planning recruitment programmes. This paper describes a statistical technique which has proved useful for the measurement and prediction of turnover.     

Sir Godfrey Thomson: a statistical pioneer

Summary.  Godfrey Thomson (1881–1955) was a leading figure in intelligence testing who made his name in that field first at Armstrong College, Newcastle, and then at the University of Edinburgh. In the course of his practical work he identified many theoretical problems which were essentially statistical in character. In particular, he used maximum likelihood estimation as early as 1919 and his statistical work largely set the course of modern factor analysis and related techniques. His statistical abilities were recognized, at different stages of his career, by both Karl Pearson and Sir Ronald Fisher. His key insight was to recognize the importance of Fisherian inference for the future of that subject.     

The South African Monoplane Hysteria: An Evaluation of the Usefulness of Smelser's Theory of Hysterical Beliefs*

An outbreak of monoplane sightings within British South Africa during 1914 is examined as a case of mass hysteria. The incident is used to evaluate the utility of Smelser's category of the negative or hostile hysterical belief manifestation within Smelser's value-added theory of collective behavior, namely: structural conduciveness, structural strain, growth and spread of a generalized belief, mobilization of participants for action, and inadequate measures by agencies of social control. Each of these was found to be present during the period immediately prior to and encompassing the collective episode, thus supporting Smelser's explanation. However, Smelser's objectivist approach labels collective behavior as irrational and is limited beyond providing a general ordering of conditions involved in a particular collective action.     

Correlates of partner abuse in male same-sex relationships

We investigated correlates of partner abuse in male same-sex relationships in a randomly selected community sample (N = 186). We included factors associated with abuse in heterosexual relationships, as well as factors of relevance to gay relationships. We assessed perpetration and receipt of partner abuse to examine whether variables were associated independently with abuse perpetration and/or receipt. Correlates of same-sex partner abuse were largely parallel to established correlates of heterosexual abuse. Income, education, and attachment orientation were associated with bidirectional partner abuse, and family violence and substance use were uniquely associated with victimization. Further, there were factors unique to same-sex partner abuse; HIV status and public outness were associated with bidirectional partner abuse, and internalized homophobia was uniquely associated with abuse perpetration.     

Methods for testing subblock patterns

A number of statistical tests have been recommended over the last twenty years for assessing the randomness of long binary strings used in cryptographic algorithms. Several of these tests include methods of examining subblock patterns. These tests are the uniformity test, the universal test and the repetition test. The effectiveness of these tests are compared based on the subblock length, the limitations on data requirements, and on their power in detecting deviations from randomness. Due to the complexity of the test statistics, the power functions are estimated by simulation methods. The results show that for small subblocks the uniformity test is more powerful than the universal test, and that there is some doubt about the parameters of the hypothesised distribution for the universal test statistic. For larger subblocks the results show that the repetition test is the most effective test, since it requires far less data than either of the other two tests and is an efficient test in detecting deviations from randomness in binary strings.     

A model for national planning policies

This paper attempts to develop a multiobjective model to help policy-makers choose the most appropriate mix of economic policies concurrent with the elimination of serious gaps. Each individual policy attempts to achieve a specific goal or a set of subgoals; but it may hinder the achievement of some other subgoals. To differentiate between the importance of different objectives, the analyst assigns different priorities to each of the given set of subgoals. Three sets of results are provided by three separate computer runs of this model. Each set of results corresponds to one of the three priority structures, and each run indicates quite differing underachievements or over-achievements of individual subgoals. A detailed explanation for each of these deviations (gaps) from the targeted subgoals is attempted in an overall framework and some interactions between various gaps (savings gaps, foreign exchange gap, domestic growth gap, GNP gap, etc.) are also identified.     

A Linear Model for Managing the Risk of Antimicrobial Resistance Originating in Food Animals

A linear population risk model used by the U.S. Food and Drug Administration (FDA) Center for Veterinary Medicine (CVM) estimates the risk of human cases of campylobacteriosis caused by fluoroquinolone-resistant Campylobacter. Among the cases of campylobacteriosis attributed to domestically produced chicken, the fluoroquinolone resistance is assumed to result from the use of fluoroquinolones in poultry in the United States. Properties of the linear population risk model are contrasted with those of a farm-to-fork model commonly used for microbial risk assessments. The utility of the linear population model for the purpose for which it was used by CVM is discussed.