Quantity represents (generally) quantitative data by having some amount of a repeated element — whether it’s a knitting motif, a pick of weaving (e.g. a weft yarn), or an embroidered shape.
If you’re working with very large data sets, it may not be feasible to have one thing in the textile represent one of whatever the data was measuring. In such a case, you can decide that one repetition represents some larger quantity (10? 100? 100,000,000?) of things.