Microdata.
Microdata files are those that contain information on individuals rather
than aggregate data . The U.S. Census Bureau's
"Summary Tape Files" contain aggregate data and consist of totals of
individuals with various specified attributes in a particular geographic
area. They are, in a sense, tables of totals. The Bureau's PUMS (Public Use
Microdata Sample) files, however, contain the data from
the original census survey instrument with certain information removed to
protect the confidentiality of the respondent.
Branching