[54] The high-technology definition used here is from the Bureau of Labor Statistics and differs from that used in earlier sections.

[55] See Hecker (2005) for their definition and methodology for determining high-technology industries. Several industries identified by the Bureau of Labor Statistics as high technology are not available in the Census Bureau's data prior to 2003.

[56] Corptech classifies 17 fields as high technology: factory automation, biotechnology, chemicals, computer hardware, defense, energy, environmental, manufacturing equipment, advanced materials, medical, pharmaceuticals, photonics, computer software, subassemblies and components, testing and measurement, telecommunications and the Internet, and transportation. For more information, see

[57] Comparable data on angel capital investment is not available prior to 2001.