498 • Big Data Analytics
As an example, one of us received an interesting notication one day
from our credit card carrier; a rather large and unusual purchase had been
made with our number at a fabric store we never frequented. e credit
card algorithm correctly identied this action as an anomaly (a positive
use of big data). Of course, we did not respond directly to the text message
we received, but instead we called the credit card company directly, agreed
that the purchase was illicit, and had a new credit card issued under a
new number. In addition, we purchased wallets that have embedded metal
in order to function as Faraday cages—enclosures of conducting material
that blocks external electrical elds (the downside is that Faraday ca ...