There was a time when businesses had to give index cards and other similar cards for their customers to fill as a survey. This was how they measured their success or failure in marketing. With this method, they would collect static data like names, addresses, customer satisfaction levels, items purchased, etc.
Source : http://www.datasciencecentral.com/xn/detail/6448529:BlogPost:1014413
Date : January 30, 2021 at 11:24PM
Tag(s) : #DATA ENG
