Components of class : NY Times interactive graph:

http://www.nytimes.com/packages/html/national/20050515_CLASS_GRAPHIC/index_01.html

from the website:

One way to think of a person's position in society is in terms of four factors - 
education, income, occupation and wealth.

visit the webpage, and just move your mouse over the 4 menu choices 
to determine your percentile ranking in the 4 components.