In many every day situations it can happen that one wants to rank the elements of a group of people having the possibility to observe them collaborating in subgroups. In this paper we propose a general way to get this ranking over the elements of a group N , starting from an arbitrary preference relation over the subsets of N and taking into account the information provided by this ranking over...

1 Abstract In our rst participation in TREC, our focus was on improving the basic ranking systems and applying text clustering techniques for query expansion. We tested a variety of techiniques including reference measures, passage retrieval, and data fusion for the basic ranking systems. Some te-chiniques were used in the oocial run, others were not used because of time limitations. We applied...

Objectives To examine how the selection of different risk adjustors and statistical approaches affect the profiles of physician groups on patient satisfaction. Data sources Mailed patient surveys. Patients with asthma were selected randomly from each of 20 California physician groups between July 1998 and February 1999. A total of 2,515 patients responded. Study design A cross-sectional study. ...

There has been a recent surge of interest in studying permutation-based models for ranking from pairwise comparison data. Despite being structurally richer and more robust than parametric ranking models, permutation-based models are less well understood statistically and generally lack efficient learning algorithms. In this work, we study a prototype of permutation-based ranking models, namely,...

Accurate probability-based ranking of instances is crucial in many real-world data mining applications. KNN (k-nearest neighbor) [1] has been intensively studied as an effective classification model in decades. However, its performance in ranking is unknown. In this paper, we conduct a systematic study on the ranking performance of KNN. At first, we compare KNN and KNNDW (KNN with distance weig...

Group formation of rhesus monkeys, often leads to victims of repeated attacks by the high ranking animal. We reported a case of an injured middle ranking monkey from repetitive and persistent aggression. 4-male rhesus group was formed by a rapid group formation strategy 2 years ago. One monkey in the group suddenly showed depressive and reluctant movement. Physical examination revealed multiple...

In the past few years, there has been much work on incorporating fairness requirements into algorithmic rankers, with contributions coming from data management, algorithms, information retrieval, and recommender systems communities. this survey, we give a systematic overview of work, offering broad perspective that connects formalizations approaches across sub-fields. An important contribution ...