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David Melton

I think the thickness of the bands are related to total bandwidth (both directions), while the color indicates the origin of the majority of the movers. For example, when hovering over Florida, the band connecting to New York is black, indicating that more people are migrating from New York to Florida than Florida to New York.

Maja

But how then David can you tell the direction of the migration flow between Florida and Georgia, where the band is red either way?

Shane Knudsen

I do wonder a bit at the choice of colors, as they're, forgive me, a bit of a red herring.

Look at the thickness of the linking lines at either end. The ends represent "flow" from that location. If the flow is larger at, say, California than Nevada, that means more people are leaving California for Nevada than leaving Nevada for California. If there's any doubt, just mouse over a link in the original article, and it'll give you explicit numbers and direction. In many cases, it's about even, as in between Florida and Georgia.

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