Methodology

The Percentage of College Graduates is computed by summing up the respondents who reported having college degrees (see example below) and dividing by the total number of people sample. All the respondents who did NOT answer having some form of college degree reported various levels of education that were below college, e.g. 11th grade, "Some college, no degree", etc. Consider the following example:

These values are what are retrieved from the U.S Census 2011 ACS 5-year average Survey:

From this data, a simple division calculation is performed as follows: