Census is the study of what our population distribution is.
I for example am in the "I am an oil snob and like Amsoil, Maxima and Motul, while disliking Valvoline and Mobile as "ordinary" brands" population group.
The ConCensus is that I'm extremely wrong, as Valvoline is obviously ahead of the game, and Mobil's only ordinary feature is that you don't have to be Indiana Jones to find it.