The crossfilter.js library
Crossfilter is also a library created by D3's author Mike Bostock, initially used to power analytics for Square Register.
-Crossfilter Wiki (August 2013)
In other words, Crossfilter is a library that you can use to generate data dimensions on large and typically flat multivariate datasets. So what is a data dimension? A data dimension can be considered as a type of data grouping or categorization while each dimensional data element is a categorical variable. Since this is still a pretty abstract ...