Peter Schmidt: Econometrician and consummate professional

Peter Schmidt has been one of its best-known and most respected econometricians in the profession for four decades. He has brought his talents to many scholarly outlets and societies, and has played a foundational and constructive role in the development of the field of econometrics. Peter Schmidt has also served and led the development of Econometric Reviews since its inception in 1982. His judgment has always been fair, informed, clear, decisive, and constructive. Respect for ideas and scholarship of others, young and old, is second nature to him. This is the best of traits, and Peter serves as an uncommon example to us all. The seventeen articles that make up this Econometric Reviews Special Issue in Honor of Peter Schmidt represent the work of fifty of the very best econometricians in our profession. They honor Professor Schmidt's lifelong accomplishments by providing fundamental research work that reflects many of the broad research themes that have distinguished his long and productive career. These include time series econometrics, panel data econometrics, and stochastic frontier production analysis.     

模具设计课程教学与企业实践中的几点不同之处

依据高职院校模具专业人才培养能力定位，结合模具企业工作岗位能力要求，结合教学与模具企业工作实际，提出了模具设计课程教学中需要增设的内容，希望能对该专业教师及教辅人员有一定启发和帮助，并能达到良好的教学效果与预期的教学目标。     

Designs for estimating the difference between two responses

In this paper the problem of designing experiments for estimating the difference between responses at two arbitrary points in the region of interest is considered. Under the average mean squared error criterion the design moment conditions have been worked out. The results have been applied to the class of central composite designs.     

On the use of partial confounding for the construction of alternative regular two-level blocked fractional factorial designs

In this paper, we consider experimental situations in which a regular fractional factorial design is to be used to study the effects of m two-level factors using n=2^m−k experimental units arranged in 2^p blocks of size 2^m−k−p. In such situations, two-factor interactions are often confounded with blocks and complete information is lost on these two-factor interactions. Here we consider the use of the foldover technique in conjunction with combining designs having different blocking schemes to produce alternative partially confounded blocked fractional factorial designs that have more estimable two-factor interactions or a higher estimation capacity or both than their traditional counterparts.     

Social work values,anti-discriminatory practice and working with older lesbian service users

It has been suggested that social workers are not adequately meeting the needs of lesbians and gay men. This paper explores some of these concerns with reference to social work's theoretical underpinnings and value-base in relation to working with older, non-heterosexual women. The paper considers some of the particular issues that affect the lives and needs of older women whose primary relationships are or have been with other women. It concludes with a discussion of ways in which such issues may be addressed in social work education, training and practice.     

Methods used to teach social work students in the field: A research report from New Zealand

This article reports the findings of research conducted in three schools of social work in New Zealand on 'methods' used to teach social work students in the field. Students were polled before the first placement ( N = 80) to find how 'effective' they rated a range of teaching methods. This was followed up by a post-placement student survey ( N = 77) to ascertain the extent to which these same methods were employed by field educators. Pre- and post-placement student results were compared with the effectiveness ratings that field educators ( N = 130) gave to each method. Field educator and student pre-placement ratings listed most methods as being effective or very effective. Post-placement student survey results suggest consistent incongruity between the effectiveness ratings given to each 'method' by field educators, and the degree to which field educators actually utilised the methods with students during the field placement. Students report that methods enabling the direct observation of their practice were amongst those least used in the field.     

Concurrent consideration of product design,process planning and production planning activities

In manufacturing engineering, product design, process planning and production planning activities are often considered independently. However, in order to effectively respond to changes in business situations, such as changes in demand forecast, product mix and technology, it is desirable to consider them concurrently. For this purpose, a large-scale linear programming model has been developed. The model considers minimization of the sum of processing cost, late shipment cost and inventory holding cost as the objective, and concurrently selects product designs, and generates process plans and production plans. The number of columns in the formulation can be large and, hence, an efficient column generation scheme is developed to solve the model. The model and solution procedure are illustrated with examples.     

区域性学业水平测试质量分析——小学数学学业水平检测试卷与课程标准一致性的视角

区域性学业水平测试是地方教育行政部门监测教育质量的重要方法。因此,分析区域性学业水平测试质量就显得十分重要。为此,借鉴韦伯一致性分析模式,对某地区小学数学学业水平检测试卷的质量进行了尝试探究,即从学习领域和年级两个方面分析了区域性小学数学学业水平测试与课程标准的一致性水平状况及特征。同时,还从数与代数、空间与图形、统计与概率、实践与综合应用等学习领域和知识种类、知识深度、知识广度和知识分布平衡性等"一致性维度"进行了归因分析。     

Inequality for equireplicated n-ary block designs with unequal block sizes

It is shown that certain inequalities known for binary, equireplicated, equiblock-sized block designs remain valid for equireplicated n-ary block designs with unequal block sizes. The approach used here is based on the spectral expansion of the C-matrix of the block design. The main theorems include some useful and combinatorially interesting results.     

Optimal estimation of a finite population mean under generalized random permutation models

Employing certain generalized random permutation models and a general class of linear estimators of a finite population mean, it is shown that many of the conventional estimators are “optimal” in the sense of minimum average mean square error. Simple proofs are provided by using a well-known theorem on UMV estimation. The results also cover certain simple response error situations.