In ordinary discourse we appear to ta1k about many things that have seemed mysterious to philosophers. We say that there has been a hitch in our arrangements or that the solution to the problem required us to examine all the probable outcomes of our action. So it would seem that we speak as if in addition to eloeks, mountains, queens and grains of sand there are hitches, arrangements, solutions, probiems, and probable outcomes. It is not immediately obvious when we must take such ta1k as really assuming that there are such to develop tests for things, and one of the tasks in this book is discerning what has eome to be called ontological commitment, in naturallanguage. Among the entities that natural language appears to make reference to are those connected with temporal and modal discourse, times, possibilities, and so on. Such entities play a crueial role in the kind of semantieal theories that I and others have defended over many years. These theories are based on the idea that an essential part of the meaning of a sentence is constituted by the conditions under whieh that sentenee is true. To know what a sentence says is to know what the world would have to be !ike for that sentence to be true.

This book covers water quality indices (WQI) in depth – it describes what purpose they serve, how they are generated, what are their strengths and weaknesses, and how to make the best use of them. It is a concise and unique guide to WQIs for chemists, chemical/environmental engineers and government officials. Whereas it is easy to express the quantity of water, it is very difficult to express its quality because a large number of variables determine the water quality. WQIs seek to resolve the difficulty by translating a set of a large number of variables to a one-digit or a two-digit numeral. They are essential in communicating the status of different water resources in terms of water quality and the impact of various factors on it to policy makers, service personnel, and the lay public. Further they are exceedingly useful in the monitoring and management of water quality. With the importance of water and water quality increasing exponentially, the importance of this topic is also set to increase enormously because only with the use of indices is it possible to assess, express, communicate, and monitor the overall quality of any water source. - Provides a concise guide to WQIs: their purpose and generation - Compares existing methods and WQIs and outlines strengths and weaknesses - Makes recommendations on how the indices should be used and under what circumstances they apply

The use of numbers to condense complex systems into easily digested 'bites' of information is very much in fashion. At one level they are intended to enhance transparency, accountability and local democracy, while at another they provide a means of enhancing performance. However, all indicators suffer from the same basic problem that, ironically, is also their biggest advantage - condensing something highly complex into a few simple numbers. Love them or hate them, there is no denying that people use indicators to make decisions. Indices and Indicators explores the use of indicators within the field of human development. Part I provides a brief outline of the contested meaning of 'development' and how indices and indicators have been used as means of testing the realization of these development visions in practice in a range of institutional contexts. Part II discusses the limitations of such indices and indicators and illustrates how they are dependent upon the vision of development adopted. The book also suggests how indices and indicators can best be employed and presented. Given our overwhelming reliance on indices and indicators for measuring progress, directing policy and allocating resources, this book is essential core reading for academics, undergraduate and post-graduate students in social science, economics, geography and development studies as well as development practitioners, policy-makers and donor and international funding agencies.

In 1989 the first edition of this book set out Gittins' pioneering index solution to the multi-armed bandit problem and his subsequent investigation of a wide of sequential resource allocation and stochastic scheduling problems. Since then there has been a remarkable flowering of new insights, generalizations and applications, to which Glazebrook and Weber have made major contributions. This second edition brings the story up to date. There are new chapters on the achievable region approach to stochastic optimization problems, the construction of performance bounds for suboptimal policies, Whittle's restless bandits, and the use of Lagrangian relaxation in the construction and evaluation of index policies. Some of the many varied proofs of the index theorem are discussed along with the insights that they provide. Many contemporary applications are surveyed, and over 150 new references are included. Over the past 40 years the Gittins index has helped theoreticians and practitioners to address a huge variety of problems within chemometrics, economics, engineering, numerical analysis, operational research, probability, statistics and website design. This new edition will be an important resource for others wishing to use this approach.

The area of food adulteration is one of increasing concern for all those in the food industry. This book compares and evaluates indices currently used to assess food authenticity.

Originally published in 1996, The International Guide to Securities Market Indices provides a comprehensive overview of the securities market indices and offers assistance to professionals as well as individual investors in the selection of an appropriate securities market index, on a worldwide basis. The Guide’s identifies and catalogues available performance indicators along with their publishers and describes their relevant characteristics and a perspective on their historical price and total return performance. It also contains descriptive profiles along with historical performance data on 400 of the world’s leading global, regional and local securities market indices and sub-indices covering 10 asset classes.