Dark Data

Dark Data

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 Why What You Don’t Know Matters

"Data describe and represent the world. However, no matter how big they may be, data sets don't - indeed cannot - capture everything. Data are measurements - and, as such, they represent only what has been measured. They don't necessarily capture all the information that is relevant to the questions we may want to ask. If we do not take into account what may be missing/unknown in the data we have, we may find ourselves unwittingly asking questions that our data cannot actually address, come to mistaken conclusions, and make disastrous decisions. In this book, David Hand looks at the ubiquitous phenomenon of "missing data." He calls this "dark data" (making a comparison to "dark matter" - i.e., matter in the universe that we know is there, but which is invisible to direct measurement). He reveals how we can detect when data is missing, the types of settings in which missing data are likely to be found, and what to do about it. It can arise for many reasons, which themselves may not be obvious - for example, asymmetric information in wars; time delays in financial trading; dropouts in clinical trials; deliberate selection to enhance apparent performance in hospitals, policing, and schools; etc. What becomes clear is that measuring and collecting more and more data (big data) will not necessarily lead us to better understanding or to better decisions. We need to be vigilant to what is missing or unknown in our data, so that we can try to control for it. How do we do that? We can be alert to the causes of dark data, design better data-collection strategies that sidestep some of these causes - and, we can ask better questions of our data, which will lead us to deeper insights and better decisions"

 Today, we all make decisions using data. Dark Data shows us all how to reduce the risk of making bad ones.

  • Princeton University Press; February 2020
  • ISBN: 978-3-511-29390-1
  • Title: Dark Data
  • Author: David J. Hand
  • Imprint: Princeton University Press
  • Language: English
In The Press
"When we make decisions in our personal and professional lives, we typically start with some form of data. The very word 'data' derives from the Latin meaning 'something given.' But who gave it? Where is it from? Should I accept it at face value? Opening our eyes to the pitfalls of taking 'something given' for granted, this insightful book should be required reading for everyone in an age when 'fake news' and the explosion of data go hand in hand."—Adrian Smith, director and chief executive of The Alan Turing Institute

About The Author
David J. Hand is emeritus professor of mathematics and senior research investigator at Imperial College London, a former president of the Royal Statistical Society, and a fellow of the British Academy. His many previous books include The Improbability Principle, Measurement: A Very Short Introduction, Statistics: A Very Short Introduction, and Principles of Data Mining.

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