分物流市场一杯羹

帕拉里亚很清楚，科尔根先生是因朋友的再三推荐才同意会面的。然而，在巧克力薯条的诱人香气里，不到半小时，科尔根先生就放松了警惕，态度也缓和了不少。不到一个小时，帕拉里亚开始谈起与优兹食品公司（Utz）的货运协议。     

The average area under correlated receiver operating characteristic curves: a nonparametric approach based on generalized two-sample Wilcoxon statistics

It is well known that, when sample observations are independent, the area under the receiver operating characteristic (ROC) curve corresponds to the Wilcoxon statistics if the area is calculated by the trapezoidal rule. Correlated ROC curves arise often in medical research and have been studied by various parametric methods. On the basis of the Mann–Whitney U-statistics for clustered data proposed by Rosner and Grove, we construct an average ROC curve and derive nonparametric methods to estimate the area under the average curve for correlated ROC curves obtained from multiple readers. For the more complicated case where, in addition to multiple readers examining results on the same set of individuals, two or more diagnostic tests are involved, we derive analytic methods to compare the areas under correlated average ROC curves for these diagnostic tests. We demonstrate our methods in an example and compare our results with those obtained by other methods. The nonparametric average ROC curve and the analytic methods that we propose are easy to explain and simple to implement.     

Reflections on the assessment of outcomes in child care

Measuring the outcomes of social work interventions with children raises complex issues. The instability of intermediate outcomes emphasises the need to undertake regular and carefully timed assessments. Differences in approach and perspective can obscure relationships between evaluations of organisational performance and assessments of outcome for individual children; user perspectives introduce another point of view. Assessing outcomes of family support services raises questions of accountability. Aggregate information about children looked after, collected through the Looking After Children project, should help to establish the chances of certain outcomes being realised, although the influence of some factors may not be easy to explain.     

Introducing strategic management

This is a report on the International Conference on Strategic Management, held at Vanderbilt Graduate School of Management (14–18 May 1973). At the conference, senior academics, businessmen and consultants from fifteen countries met to discuss the problems of implementing strategic planning.     

Older people's experiences of community life: patterns of neighbouring in three urban areas

This paper examines changes to the community life of older people living in three urban areas of England: Bethnal Green, Wolverhampton and Woodford. All three were the subject of classic community studies in the 1940s and 1950s, these providing rich material about the lives of groups such as elderly people. Using this earlier research as a baseline, the paper presents data on how the experience of living in urban neighbourhoods has changed for older people in the intervening years. The article reviews the relationship between elderly people and their neighbours, drawing on quantitative as well as qualitative data. In conclusion, the paper identifies a number of general arguments pointing to the value of a community and locality perspective for understanding the impact of social changes on later life.     

Testing a block exchangeable covariance matrix

Testing hypotheses about the structure of a covariance matrix for doubly multivariate data is often considered in the literature. In this paper the Rao's score test (RST) is derived to test the block exchangeable covariance matrix or block compound symmetry (BCS) covariance structure under the assumption of multivariate normality. It is shown that the empirical distribution of the RST statistic under the null hypothesis is independent of the true values of the mean and the matrix components of a BCS structure. A significant advantage of the RST is that it can be performed for small samples, even smaller than the dimension of the data, where the likelihood ratio test (LRT) cannot be used, and it outperforms the standard LRT in a number of contexts. Simulation studies are performed for the sample size consideration, and for the estimation of the empirical quantiles of the null distribution of the test statistic. The RST procedure is illustrated on a real data set from the medical studies.     

Exploring Neighborhood Effects on Health and Life Satisfaction: Disentangling Neighborhood Racial Density and Neighborhood Income

This study examines the independent and synergistic influences of neighborhood racial density and neighborhood income on several indicators of health status and life satisfaction in a sample of 311 adult African Americans living in New York City. This is made possible by the two-stage sampling procedure that was used in the collection of the data, ensuring that respondents?? neighborhoods vary on both racial density and income. Findings from a series of OLS regression models that adjust standard errors to account for the non-independence of observations demonstrate that neighborhood income moderates the relationship between racial density and health and life satisfaction. When neighborhood income is low, high neighborhood racial density is detrimental for health and life satisfaction. However, when neighborhood income is high, neighborhood racial density is protective for health and life satisfaction. These results indicate that the role of neighborhood income needs to be considered when examining the relationship between neighborhood racial density, health, and life satisfaction. Moreover, these findings may provide insight for understanding the past conflicting results.