Johan
Ex got M3 in the divorce, waiting for EU Model Y!
Why not do it right and use the classification used by the US Cencus instead of making up categories:
Industry and Occupation - Indexes - People and Households - U.S. Census Bureau
http://www.census.gov/people/io/files/2010%20Occupation%20Index%2008132013.xls
Industry and Occupation - Indexes - People and Households - U.S. Census Bureau
http://www.census.gov/people/io/files/2010%20Occupation%20Index%2008132013.xls