In the world of data scientists you’ll often hear the phrase GI-GO (like the soldier): garbage in, garbage out. That’s a little too politically correct, especially if you were on the receiving end of some of the poor data. We prefer crap in, crap out to be a more accurate depiction of the trench warfare that is data munging.
Crap in, crap out generally manages expectations for the non-data inclined. Too frequently I’ve seen mangey data sets handed to engineers under the false hope that the end result will yield whatever nugget of gold someone preconceived.
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