Home-building was more labor-intensive then because of cruder tools and equipment, materials were harder to come by and houses were smaller because they didn't include bathrooms or kitchens.
The goal is to extract a smaller set of data that can be analyzed, using any of the same visualization or analytical tools that would be used for other data types.
And ETFs are among the favorite toolsof fast-trading hedge funds, which can dart in and out ofsmaller overseas markets so quickly that market makers occasionally have trouble adjusting share prices in time.