The high networth listing is derived from 18 months of data.
Since the wealth does not change that often, this time frame should be satisfactory.
This is our best effort to determine America's high networth group programmatically.
Duplicate counting is possible, therefore, the net may be exaggerated,
but the order of magnitude should be right.
Sometimes, you may see some institutional management firms mixed into the listing.
This is the kind of noise you have to take out. Your best bet is to focus on the entries
with high concentration (small count on that column).