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Center for International Earth Science Information Network - CIESIN. 1996. Archive of Census Related Products (ACRP): 1990 Enhanced Migration Files. Palisades, New York: NASA Socioeconomic Data and Applications Center (SEDAC). https://doi.org/10.7927/H4057CV3. Accessed DAY MONTH YEAR.
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The migration files are county to county migration data files organized by state which contain enhancements that involve separations of table matrices, the addition of multiple count fields for in and out moves on table matrices, and creation of a third file for net-migration flows. In all files, information about immigration and emmigration are stored on a single record for ease of processing.
The "p1" and "p2" files contain all the data from the original census STP28 files. The data in the p1 files are extracted by race while the p2 files provide data based on hispanic origin. The p1 and p2 files have been improved by creating two count fields per record in place of one: the POPIN field contains person counts moving into the county (COUNTY) from another county (COUNTY2), while the POPOUT field contains person counts moving in the opposite direction. Both county codes appear in each record to make processing easier for subsetting the files.
The total flows (tf) state level file contains "total flows" of persons for all states (into the county, out of the county, and within county moves). These flows are reported for all counties within a state, and all counties outside of the state which were sources or destinations of moves involving the state of interest. This file was created by aggregating the more detailed data in the p1 file.
The interstate migration (im) files were created in order to generate the total flows (tf) files. The "im" files contain all migration from a state of interest to all other states.
directory path: /pub/census/usa/stp
ASCII text (.asc)
Macro that reads the county to county special migration files and converts the raw files to 3 SAS data sets: a total population flow, and p1 and p2 files (see file stp28c.sas).