Signals always point to something. In this sense, a signal is not a thing but a relationship. Data becomes useful knowledge of something that matters when it builds a bridge between a question and an answer. This connection is the signal.
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Everything that informs us of something useful that we didn't already know is a potential signal. If it matters and deserves a response, its potential is actualized.
By the time your perfect information has been gathered, the world has moved on.
The latest technologies are often sexy, but beware of solutions that vendors dress up like trollops, unless you're looking for a one-night stand.
To find signals in data, we must learn to reduce the noise - not just the noise that resides in the data, but also the noise that resides in us. It is nearly impossible for noisy minds to perceive anything but noise in data.
To have an eye for opportunity is to be a Data Scientist.
Blogging, writing conventional articles, and being science consultant and pocket protector ninja to various web portals and TV programs, quite often trying to promote the penicillin of hard data to people who had no interest in being cured of their ignorance.