Currently, I'm working on a project that involves geographic mobility by education. However, I encounter an issue when trying to interpret the data. For example, below is an data from Geographic Mobility by Selected Characters in the U.S. using 2009 ACS 1-Year Estimate. Let say I'm looking at people who have a BA degree and who moved from a different state. The Table shows that the estiamted of these people is 2.5%. I wonder about what is the base here. In other words, 2.5% of what? 2.5% of total population? or, 2.5% of college graduates?
I would think it's the percent of the total (first column, labeled "Total"). So, using your example, people who have a bachelor's degree and moved from a different state would be 2.7% of 43,585,028 (total in first column).
Moved; within same county
Moved; from different county, same state
Moved; from different state
Moved; from abroad
Margin of Error