Dec. 7, 2008 -- Numbers, numbers everywhere -- and nowhere to hide. This is the theme of BusinessWeek columnist Stephen Baker's book, "The Numerati."
With gee-whiz enthusiasm, he tells a number of fascinating stories about ever cheaper, ever more powerful computer chips and the tools and techniques they make possible -- tools and techniques that will increasingly and dramatically affect nearly every area of our lives.
Smart Carts in Supermarkets
The bulk of the book is devoted to examples.
A particularly nice one concerns the chips and new software being developed that will monitor our buying habits in supermarkets via the use of store cards and smart carts. These will note what we buy and infer from our purchases whether we're on a budget (relatively constant expenditures), whether we're following a diet (low- fat foods), and whether we've fallen off of it (high-fat ice creams).
The cart will also remind us if it finds that we've forgotten something and determine how brand-loyal and price-sensitive we are. It will discover our buying personalities and likely demographic characteristics, track our path through the store, and suggest changes in layout to stimulate sales of high-profit items.
Through interviews with scientists at various software companies, ranging from giants like Yahoo and Google to a number of smaller boutique firms, Baker attempts to humanize the story of those he terms the numerati. They are the mathematicians, computer scientists, and others who are, every day, devising better software models of us as consumers, workers, patients, lovers, voters, and even terrorists.
Despite its topic, the book contains no mathematics although Baker does periodically hint at notions from statistics, operations research, graph and network theory that make the new software possible.
Interestingly, a few numerati are even analyzing blogs because bloggers provide unfiltered, raw, generally honest reactions to products (from diarrhea medicines to golf clubs) that information-hungry companies want.
Countless blogs are scanned for mention of these products (or issues) and the computer is taught to determine the sex, approximate age, and other demographic characteristics of the bloggers. The information thus obtained helps the companies discern tastes and target ads (much like Google and Amazon are doing already).
Medical Data Mining, Terrorism and Pictures
On the drawing boards, too, are new medical software programs and devices which churn through volumes of information to monitor patients' health, especially that of older people. One example is a special floor sensor that can detect the changes in the speed and symmetry of grandpa's gait, the frequency of his visits to the refrigerator or bathroom, and other characteristics.
The sensor then determines whether he's especially unsteady in the morning (maybe too many meds the night before), whether he's on the verge of a stroke, as well as the probability of a host of other conditions. Phone software can detect if the time it takes him to recognize loved ones' voices has grown a fraction of a second longer and draw tentative conclusions and an invitation for specific tests. This would be especially helpful with Parkinson's disease, which often signals itself by changes in voice and gait up to decade before it's diagnosed by doctors.
The chapter on terrorism tells of the torrent of data available from the FBI, CIA, publicly available databases, as well as monitored phone calls (some legally, many not), Web site visits, transportation records, tax filings, ubiquitous cameras and who knows what else. This informational tsunami rushes past the National Security Agency's numerati, who attempt to pan nuggets out of the torrent.
Baker duly notes the danger of false positives in this endeavor. With ever more pieces of information and ever more superficially suspicious interconnections among them, the vast majority of the people picked out will likely be innocent. Note the million names or so on the airline watch list and appreciate the continuing importance of habeas corpus.
Baker mentions other ethical issues, too. What if a profile constructed from all available data had a certain probability of picking out a prospective pedophile. Would a school, for example, be liable if it uses or fails to use this information in the hiring of applicants? What if the probability were 25 percent? Or 90 percent?
More technical problems arise when data mining pictures, graphics and videos. These play an increasingly salient role in a less print-oriented culture and political environment, yet they're hard to search through and classify. If interested parties could quickly search YouTube, for example, and locate blatantly inconsistent statements by politicians, that would make lying (alright, spinning) less attractive.
Different Realms, Same Techniques
Since mathematics is a somewhat imperialistic discipline, the same software tools and data mining techniques useful in one domain apply in many disparate realms, as well. The ideas employed to find terrorists' messages and their senders are also used to find e-mail spam and its origins, to find dangerous molecules in our blood, to find suitable fits between workers and jobs, or to find potentially compatible mates.
The connection among these various tasks is often nominal, consisting in no more than the fact that they all use similar mathematical tools.
Despite the slightly sinister, Svengali-like sound to "the numerati," Baker writes near the end of the book that these folks and their mathematical tricks will, for the most part, make our lives easier (unless we're trying to hide our hangover from the snooping floor).
Far from being controlling, they will allow us to be more fully who we choose to be. Just as we all drive cars without understanding what a carburetor does, we'll all use these software tools without understanding how dynamic optimization works.
John Allen Paulos, a professor of mathematics at Temple University, is the author of the best-sellers "Innumeracy" and "A Mathematician Reads the Newspaper," as well as of the just-released "Irreligion: A Mathematician Explains Why The Arguments for God Just Don't Add Up ". His "Who's Counting?" column on ABCNews.com appears the first weekend of every month.