Picturing the Uncertain World: How to Understand, Communicate, and Control Uncertainty through Graphical Display

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Overview

"Wainer's book is a delight to read. Readers will come away with a clear understanding of how uncertainty, properly measured, can help us make decisions and can provide a skeptical aura about the facts behind those decisions. Wainer's examples show how statistical reasoning is needed to make sense of what our observations tell us. This book offers insights beyond what is usually taught in statistics courses."—David Salsburg, author of The Lady Tasting Tea: How Statistics Revolutionized Science in the Twentieth Century

"An entertaining and thought-provoking book. From displaying the Medicare drug benefit and trends in test scores and school spending, to unraveling Freedle's folly, Howard Wainer tells story after story about the understanding and display of variation."—Andrew Gelman, author of Red State, Blue State, Rich State, Poor State

"Feel like you're drowning in data? Howard Wainer is an enthusiastic advocate for graphs and statistics' ability to clarify complexity. His essays illustrate how to exploit the possibilities—and avoid the pitfalls—in presenting information so that it is actually informative."—Joel Best, author of Stat-Spotting: A Field Guide to Identifying Dubious Data

"This book offers lessons on the effective presentation of numbers and how to avoid common mistakes in interpreting statistical information. At a time when statisticians are in an arms race to develop ever more complex and impenetrable statistical formulations, Wainer teaches that the purpose of statistics is to make the complex simple. He is one of the few recognized authorities on the presentation of numerical evidence."—Gary M. Klass, author of Just Plain Data Analysis

"It was a real joy to read Wainer's book. Its great strengths are the interesting examples, the insightful and instructive analysis, and the entertaining writing. There is much to be learned here, and Wainer does a superb job of bringing out the general principles. This is an important book. It clearly demonstrates the value of statistical thinking."—Karl W. Broman, University of Wisconsin-Madison

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Editorial Reviews

American Scientist
In Picturing the Uncertain World, Howard Wainer approaches this problem through stories, and every one is a gem. This is territory that has long been dominated by the books of Edward Tufte . . . but Wainer's approach is refreshingly different. He has himself been involved in many policy debates and understands well that the same information can be interpreted in a variety of ways to support widely divergent positions. . . . Like two of Wainer's earlier books . . . this one makes for very fine reading and would be an excellent text for a general-education seminar.
— Michael Goodchild
Mathematics Teacher
As enjoyable to read as it is enlightening, [Picturing the Uncertain World] includes far more than its title indicates. Throughout, Wainer illuminates many of the big ideas of statistics in ways that help the reader understand and value the ideas. He provides contrasting graphical forms to demonstrate good data displays and incorporates analogies to help readers understand why certain logical arguments are flawed. . . . Anyone would enjoy reading this book.
American Scientist
In Picturing the Uncertain World, Howard Wainer approaches this problem through stories, and every one is a gem. This is territory that has long been dominated by the books of Edward Tufte . . . but Wainer's approach is refreshingly different. He has himself been involved in many policy debates and understands well that the same information can be interpreted in a variety of ways to support widely divergent positions. . . . Like two of Wainer's earlier books . . . this one makes for very fine reading and would be an excellent text for a general-education seminar.
— Michael Goodchild
Mathematics Teacher
As enjoyable to read as it is enlightening, [Picturing the Uncertain World] includes far more than its title indicates. Throughout, Wainer illuminates many of the big ideas of statistics in ways that help the reader understand and value the ideas. He provides contrasting graphical forms to demonstrate good data displays and incorporates analogies to help readers understand why certain logical arguments are flawed. . . . Anyone would enjoy reading this book.
Information Design Journal
This is a very well-written book with subtle analyses and a refreshing approach to the field of statistics. For information designers the book offers ideal access to the science of uncertainty. Moreover . . . Wainer has succeeded in linking together two disciplines: statistical thinking and visual communication.
— Wibke Weber
World Future Review
Howard Wainer's book of the science of uncertainty (his label for the science of statistics), and how to recognize and manage it, is a combination of breezy, clever writing and unique visual examples with tutorials to clarify the technical aspects. It belongs on graphic artist's bookshelves.
— Peter F. Eder
Mathematics Magazine
Even an experienced statistician will find valuable insights in this book of careful thought, clear exposition, and fine visualization.
American Scientist - Michael Goodchild
In Picturing the Uncertain World, Howard Wainer approaches this problem through stories, and every one is a gem. This is territory that has long been dominated by the books of Edward Tufte . . . but Wainer's approach is refreshingly different. He has himself been involved in many policy debates and understands well that the same information can be interpreted in a variety of ways to support widely divergent positions. . . . Like two of Wainer's earlier books . . . this one makes for very fine reading and would be an excellent text for a general-education seminar.
Information Design Journal - Wibke Weber
This is a very well-written book with subtle analyses and a refreshing approach to the field of statistics. For information designers the book offers ideal access to the science of uncertainty. Moreover . . . Wainer has succeeded in linking together two disciplines: statistical thinking and visual communication.
World Future Review - Peter F. Eder
Howard Wainer's book of the science of uncertainty (his label for the science of statistics), and how to recognize and manage it, is a combination of breezy, clever writing and unique visual examples with tutorials to clarify the technical aspects. It belongs on graphic artist's bookshelves.
From the Publisher
"In Picturing the Uncertain World, Howard Wainer approaches this problem through stories, and every one is a gem. This is territory that has long been dominated by the books of Edward Tufte . . . but Wainer's approach is refreshingly different. He has himself been involved in many policy debates and understands well that the same information can be interpreted in a variety of ways to support widely divergent positions. . . . Like two of Wainer's earlier books . . . this one makes for very fine reading and would be an excellent text for a general-education seminar."—Michael Goodchild, American Scientist

"As enjoyable to read as it is enlightening, [Picturing the Uncertain World] includes far more than its title indicates. Throughout, Wainer illuminates many of the big ideas of statistics in ways that help the reader understand and value the ideas. He provides contrasting graphical forms to demonstrate good data displays and incorporates analogies to help readers understand why certain logical arguments are flawed. . . . Anyone would enjoy reading this book."—
Mathematics Teacher

"This is a very well-written book with subtle analyses and a refreshing approach to the field of statistics. For information designers the book offers ideal access to the science of uncertainty. Moreover . . . Wainer has succeeded in linking together two disciplines: statistical thinking and visual communication."—Wibke Weber, Information Design Journal

"Howard Wainer's book of the science of uncertainty (his label for the science of statistics), and how to recognize and manage it, is a combination of breezy, clever writing and unique visual examples with tutorials to clarify the technical aspects. It belongs on graphic artist's bookshelves."—Peter F. Eder, World Future Review

"Even an experienced statistician will find valuable insights in this book of careful thought, clear exposition, and fine visualization."—
Mathematics Magazine

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Product Details

  • ISBN-13: 9780691137599
  • Publisher: Princeton University Press
  • Publication date: 4/6/2009
  • Pages: 280
  • Product dimensions: 7.10 (w) x 9.10 (h) x 1.10 (d)

Meet the Author

Howard Wainer is distinguished research scientist at the National Board of Medical Examiners and adjunct professor of statistics at the Wharton School of the University of Pennsylvania. His many books include "Graphic Discovery" (Princeton).

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Table of Contents

Preface and Acknowledgments xv

I. Introduction and Overview

Chapter 1: The Most Dangerous Equation 5
In this chapter we nominate De Moivre's1 description of the expected variation in the arithmetic mean for the title of the most dangerous equation. To support this conclusion we describe five separate examples where ignorance of this equation has led to enormous wastes of time, money, and human resources. These five examples span almost a thousand years and areas as diverse as monetary policy, education policy, medical practice, and the genetic basis of sex differences in intelligence.

II. Political Issues
In this section we show how five different kinds of issues that emerged from essentially political arguments could be illuminated with more careful thought and a graph or two. In chapter 6, we introduce a very simple probabilistic model that yields surprising richness of understanding, which apparently escaped the editorial writers of the New York Times.

Chapter 2: Curbstoning IQ and the 2000 Presidential Election 23
Sometimes, when facts are hard to come by, people who are tasked to gather those facts simply substitute a guess. When this is done by census workers it is called "curbstoning" (as in sitting down on the curbstone in front of a house and guessing how many people live there). Curbstone estimates, although illegal and grounds for dismissal, have shown themselves to be remarkably accurate. In this chapter we look at a piece of political propaganda meant to highlight the intellectual and financial differences between red and blue states. Although it was clearly based on someone's biases and not actual data, the conclusions we would draw from the faked data are close to actual results.

Chapter 3: Stumbling on the Path toward the Visual Communication of Complexity 31
An op-ed piece in the New York Times written by former secretary of state George Schultz contained a statistical graph that showed the economic superiority of the two Bush administrations to the Clinton administration that was sandwiched in between. We show how this graphic distorts our perceptions by plotting rates of change instead of the actual GDP. The result is exactly the opposite of what former Secretary Schultz argues.

Chapter 4: Using Graphs to Simplify the Complex: Th e Medicare Drug Plan as an Example 35
The Medicare drug plan, although passed with great fanfare, quickly resolved itself into a complex puzzle. In this chapter we simplify one part of the puzzle by drawing a graph that makes clear who should sign up. The graph is not a full solution, for how the costs will be paid remains shrouded in a deep mystery indeed.

Chapter 5: A Political Statistic 39
Neither graphs nor tables are guarantees of truth. Incorrect stories can be concocted with data displays just as they can with words. In this chapter we investigate a graph produced by the U.S. Department of Education that vividly shows how fourth graders’ reading scores remain stubbornly flat despite skyrocketing increases in federal expenditures for education. A more careful look indicates that there is a strong positive relationship between students’ test scores and money spent on education.

Chapter 6: A Catch -22 in Assigning Primary Delegates 47
As the 2008 election loomed ever closer, states maneuvered in various ways to try to gain increased influence. The New York Times argued that New York's citizens were not fully enfranchised because of the all-or-none delegate assignment rule used in the primaries. Using a simple mathematical model, we show that exactly the opposite is true.

III. Educational Testing
In the four thousand years since its inception in ancient China, mental testing has promised to provide an important tool toward a true meritocratic society. Replacing family connections with an individual's ability as the key to opening the doors to economic and social success remains a principal goal of modern societies. Progress toward this goal has been impressive, but it has occurred in fits and starts. In this section we examine three proposals to aid in using test scores toward making this a more just society. The first uses a statistical method commonly employed in other circumstances to solve a vexing problem. In chapter 8 we examine a well-meaning but, at its heart, flawed scheme aimed at reducing intergroup differences. And finally, in chapter 9, we look at a recent court case involving test scoring and show that the defense's case was based on a misunderstanding of the meaning of uncertainty.

Chapter 7: Testing the Disabled: Using Statistics to Navigate between the Sc ylla of Standards and the Charybdis of Court Decisions 55
Test companies are in a logical bind. Standards of testing require that individual scores on tests given under nonstandard conditions (for instance, with extra time) be so labeled, while courts mandate that examinees with disabilities (who are often given accommodations like extra time) not be identified. In this chapter we show a statistical method that can provide a way to be responsive to these two seemingly contradictory requirements.

Chapter 8: Ethnic Bias or Statistical Artifact? Freedle's Folly 63
Social scientist Roy Freedle startled the testing world in 2003 when he showed that black examinees outperformed matched white examinees on hard SAT items. He suggested that ethnic group differences in test performance could be reduced dramatically and tests thus made fairer by making the tests harder. In this chapter we look into the validity of this remarkable conclusion.

Chapter 9: Insignificant Is Not Zero: Musing on the College Board's Understanding of Uncertainty 74
On October 8, 2005, NCS Pearson, Inc., under contract to the College Entrance Examination Board, scored an administration of the SAT Reasoning test. Subsequently it was discovered that there was a scoring error that had affected 5,024 examinees’ scores. After rescoring it was revealed that 4,411 test scores were too low and 613 were too high. The exams that were underscored were revised upward and the revised scores were reported to the designated colleges and universities. The College Board decided that "it would be unfair to re-report the scores of the 613 test takers" whose scores were improperly too high and hence did not correct them. They reached this conclusion because of a misunderstanding of statistical error. In this chapter we discuss their argument and its flaws.

IV. Mostly Methodological
This section is a bit more technical than the others, focusing more explicitly on the statistical tool, with its application being secondary. In chapter 10 we look at the validity of linear extrapolation through unexpectedly consistent improvements in the world record for men running a mile that have occurred over the course of the twentieth century and speculate whether it should have been predictable, and what, if anything, it means about future improvements in the twenty-first century. The eleventh chapter looks at statistical graphics in the popular media. Chapter 12 demonstrates how a mixture of statistical tools, statistical thinking, and various graphic forms combine to provide us with a guided pathway of discovery. The last two chapters are perhaps the most narrowly focused of all, looking first at ways to show our uncertainty graphically and next at one way in which powerful computing when combined with our desire for simplicity at all costs can be used to mislead us.

Chapter 10: How Long Is Short? 87
All functions are well approximated by a straight line for a short part of their length. But how can we know for how long the linear approximation is suitable? Obviously, when the entire data series is in hand it is easy, but what about when it is not? What do we do when we wish to extrapolate from what appears to be linear beyond the data? For a very short extrapolation it is usually fine, but how long is short? In this chapter we look at a century's progress in the world records in the mile run for help in answering this question.

Chapter 11: Improving Data Displays 92
The communication media's stock and trade is the distillation and communication of possibly complex information. To do this effectively the print media use an especially broad range of graphical formats. Sometimes they do this poorly, but sometimes they do it very well indeed. In this chapter we look at some displays devised by the media that set a standard for excellence hard to imagine given their time deadlines, as well as others that were seriously flawed.

Chapter 12: Old Mother Hubbard and the United Nations 106
Statistical thinking and data-based graphics are two tools used together to understand the world. This chapter tells a story of how a detective might use them to track down and expose some surprising aspects of poverty.

Chapter 13: Depicting Error 121
Communicating data without some measure of their precision can lead to misinterpretation and incorrect inferences. In this chapter, we describe and illustrate several conventions for displaying errors along with the data they modify. We also offer some alternatives that seem to provide improvements in the effective communication of error as well as increasing the ease, and hence the likelihood, of their use. These alternatives are illustrated principally with data from the National Assessment of Educational Progress.

Chapter 14: The Mendel Effect 148
Data are often examined after being grouped into categories. For example, we might see a plot of income shown as a function of education level, in which amount of education is collapsed (binned) into specified categories like 0-8 years, 9-11, 12, 13-15, 16 or more. A typical summary plot shows the mean value of income as a function of the binned education variable, and trends are interpreted. In this chapter, I demonstrate how such trends can be epiphenomenal and are the creation of the number of bins used and their boundaries. I provide an algorithm that can take trendless data and create trends in any direction.

V. History
We understand best those things we see grow from their very beginnings. —Aristotle, Metaphysics

The Science of Uncertainty has been under development for a long time. In this section, I pay homage to our forebears by using modern tools to investigate ancient puzzles (chapters 15 and 16), by exploring the origins of some of these modern tools (chapters 17 and 19), by defending the wisdom of the ancients from contemporary misuses (chapter 18), by communicating the wisdom of a modern master (chapter 20), and finally by a heart-rending use of graphics to paint an evocative picture of one part of what was perhaps the greatest horror in all human history.

Chapter 15: Truth Is Slower than Fiction 161
Novelists often use the latest scientific findings as essential plot elements in their stories. In this chapter, we follow how some of the findings of the nineteenth-century British polymath Francis Galton were used by Arthur Conan Doyle, by Mark Twain, and by Jules Verne, and speculate on who got there first and why.

Chapter 16: Galton's Normal 168
Francis Galton was an early adopter of the normal distribution as a means of making inferences about the frequency of occurrence of various human characteristics. In his 1869 book Hereditary Genius, he explains how to do this with a hypothetical graph showing the heights of British men. But the graph Galton made up revealed a serious misunderstanding he had about the normal distribution. In this chapter, we uncover the error and suggest its source.

Chapter 17: Nobody's Perfect 173
In 1786, the remarkable Scot William Playfair published a small book in which he invented three of the four basic graphical formats (bar charts, line charts, and pie charts). He did not invent the scatter plot. In this chapter we ask and try to answer the obvious question, "why not?"

Chapter 18: When Form Violates Fu nction 179
The title of "finest statistical graphic ever prepared" is generally awarded to the nineteenth-century Frenchman Charles Joseph Minard's remarkable six-dimensional plot showing the fate of the French army as it trekked between the Niemen River on the Poland-Russia border to Moscow and back during Napoleon's ill-fated 1812-1813 campaign. In this chapter, we examine one failing attempt to usurp Minard's famous format for another purpose.

Chapter 19: A Graphical Legacy of Charles Joseph Minard: Tw o Jewels from Th e Past 186
Not all of those who sought to emulate Minard's success with data of their own failed. In this chapter, we show how followers of Minard produced treasures of their own by following in the footsteps of the master.

Chapter 20: La Diffusion de Qu elques Idées: A Master's Voice 193
Jacques Bertin (1918-) is a French semiologist, trained in Paris, whose seminal work La Semiologie Graphique (1969) laid the groundwork for modern research in graphics. Almost forty years after its publication it still provides important lessons to all those interested in the effective display of quantitative information. In 2002 he sent me a note detailing his most recent developments and asked that I continue to help him in "la diffusion de quelques idées." This chapter tries to do exactly that.

Chapter 21: Numbers and the Remembrance of Things Past 199
A single death is a tragedy; a million deaths is a statistic.
—Joseph Stalin (1879-1953)

Unquestionably cold and cruel, this epigram conveys a sentiment that sadly captures an aspect of human psychology. The mind is limited in its capacity to fathom cataclysmic events. Great numbers of deaths, particularly if they are distant in time or space, typically do not elicit the same reaction as fewer deaths nearer to us. Sponsors and designers of memorials face the challenge of stirring emotion, memory, and understanding. In this final chapter we show and discuss data displays produced by the inhabitants of the Kovno Ghetto to record their own deaths—so that they might transform what could have been only a statistic into the tragedy that it undeniably was.

VI. Epilogue

Notes 211
References 215
Source Material 225
Index 229

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