Approximate mrpp p-values obtained from four exact moments

A F0RTRAN-77 subroutine for a general version of multi-response permutation procedures (MRPP) is described. The exact four moments are employed in conjunction with the Pearson type I, type III, and type VI distributions to calculate the associated P-values.     

Identifying Multiple Cluster Structures in a Data Matrix

Abstract

An aspect of cluster analysis which has been widely studied in recent years is the weighting and selection of variables. Procedures have been proposed which are able to identify the cluster structure present in a data matrix when that structure is confined to a subset of variables. Other methods assess the relative importance of each variable as revealed by a suitably chosen weight. But when a cluster structure is present in more than one subset of variables and is different from one subset to another, those solutions as well as standard clustering algorithms can lead to misleading results. Some very recent methodologies for finding consensus classifications of the same set of units can be useful also for the identification of cluster structures in a data matrix, but each one seems to be only partly satisfactory for the purpose at hand. Therefore a new more specific procedure is proposed and illustrated by analyzing two real data sets; its performances are evaluated by means of a simulation experiment.     

On selecting a subset which contains all populations better than a control

Let π₁…, π_k denote k(≥ 2) populations with unknown means μ₁ , …, μ_k and variances σ₁ ² , …, σ_k ² , respectively and let π_o denote the control population having mean μ_o and variance σ_o ² . It is assumed that these populations are normally distributed with correlation matrix {ρ_ij}. The goal is to select a subset, of populations of π₁ , …, π_k which contains all the populations with means larger than or equal to the mean of the control one. Procedures are given for selecting such a subset so that the probability that all the populations with means larger than or equal to the mean of the control one are included in the selected subset is at least equal to a predetermined value P?(l/k < P? < 1). The goal treated here is a first step screening procedure that allows the experimenter to choose a subset and withhold judgement about which one has the largest mean. Then, if the one with the largest mean is desired it can be chosen from the selected subset on the basis of cost and other considerations. Percentage points are also included.     

Minimax type procedures for nonparametric selection of the “best” population with partially classified data

Consider a sequence x ≡ (x₁,…, x_n) of n independent observations, in which each observation x_i is known to be a realization from either one of k_i given populations, chosen among k (≥ k_i) populations π₁, …, π_k Our main objective is to study the problem of the selection of the most reliable population π_j at a fixed time ξ, when no assumptions about the k populations are made. Some numerical examples are presented.     

A Monte Carlo study of traditional and rank-based picked-points analyses

In analysis of covariance with heteroscedastic slopes a picked-points analysis is often performed. Least-squares based picked-points analyses often lose efficiency (at times substantial) for nonnormal error distributions. Robust rank-based picked-points analyses are developed which are optimizable for heavy-tailed and/or skewed error distributions. The results of a Monte Carlo investigation of these analyses are presented. The situations include the normal model and models which violate it in one or several ways. Empirically the rank-based analyses appear to be valid over all these situations and more powerful than the least squares analysis for all the nonnormal models, while losing little efficiency at the normal model.     

情境、情感与力:暴力产生的一个解释框架

文章考察了中国农村社会初级关系圈中与纠纷、争吵、不公、委屈、怨恨等道德情感性因素勾连在一起的暴力事件。基于情境、情感和力三个因素,构建了SEPV分析框架,以此来解释此类暴力行为产生及再生产的机制。研究发现,力的不均衡容易促发暴力行为,并且在纠纷演变过程中,当事人双方的力并不是一个恒量,而是会随着情境的不同而发生改变;负面情感是暴力行为的重要促动力,其强度在纠纷演变过程中同样不断变化;情境是暴力产生的环境因素,对情感和力的施与产生刺激或抑制作用。     

依法律行为发生的不动产物权变动纠纷之程序选择

基于法律行为发生的不动产物权变动纠纷虽是司法实务中常见的案件类型,但其在理论观点和裁判意见上却长期存在分歧,既给当事人就诉讼类型和请求的选择带来困惑和误导,也造成法院同案不同判,影响司法的统一和权威。文章从案例分析入手,聚焦于房屋借名买卖法律行为引发的房屋权属确认纠纷之理论争议和司法分歧,进而探寻在我国现行法律框架下解决此类依法律行为发生的不动产物权变动纠纷的现实路径。     

Challenging the abuse decision: a comparison of American and British perspectives on complaints and appeals

The conclusion by child protection services that a child has been abused and the decision to make a formal record of that conclusion involves a process called'registration' in both the United Kingdom and the United States. This is an administrative process rather than a judicial one and is instituted by public officials not lawyers, but it can have as significant an effect on the families involved as the findings of a court Yet, despite this significance, families have found it very difficult to challenge the decision to register a case of abuse, particularly in the UK. This papers offers a critique of registration processes in the UK and in the USA and suggests ways in which these processes might be improved to protect individual rights.     

Further Evaluation of Prompting Tactics for Establishing Intraverbal Responding in Children With Autism

We compared prompting tactics to establish intraverbal responding (question answering) in four boys with autism. Based on the results of intraverbal, textual, echoic, and tact pretests, we compared vocal and picture prompts with three participants, and textual, vocal, and picture prompts with one participant. We also evaluated repeated acquisition with different question sets, and included a concurrent-chains arrangement, in which initial link selections determined which prompting procedure occurred in the terminal link. All the prompting procedures were effective in establishing intraverbal responding, but vocal prompts resulted in the fewest trials to criterion for all four participants during the initial prompt comparison. However, the results were less consistent for the second comparison. The concurrent chains arrangement revealed a clear preference for picture prompts for one participant, but the results for the others were inconclusive.