"Diapers and beer" was the go-to story for data mining of purchasing data in the 1990s. https://tdwi.org/articles/2016/11/15/beer-and-diapers-impossible-correla

"Diapers and beer" was the go-to story for data mining of purchasing data in the 1990s. https://tdwi.org/articles/2016/11/15/beer-and-diapers-impossible-correlation.aspx https://tdwi.org/articles/2016/11/15/beer-and-diapers-imposs... That link shows both how widespread the idea was, and how shaky the evidence was.