Survey of Program Dynamics (SPD)
FileSize
(in Bytes)		Compression Type (Size in Bytes)Record
Count
DOS/WindowsGNU gzipStandard Unix
Cross-Sectional File
2002 Minimally Edited Cross-Sectional File Data Dictionary 1,215,651
2002 Minimally Edited Cross-Sectional Data File5 224,395,584 6,505,821 6,505,728 7,848,777 53,696
2001 Minimally Edited Cross-Sectional File Data Dictionary4 1,187,781
2001 Minimally Edited Cross-Sectional File Data Dictionary Appendices (WordPerfect format) 237,760
2001 Minimally Edited Cross-Sectional Data File 349,812,632 10,878,377 10,878,284 13,391,145 85,154
2000 Minimally Edited Cross-Sectional File Data Dictionary4 1,543,166
2000 Minimally Edited Cross-Sectional Data File 303,547,421 12,360,957 12,360,865 22,460,556 67,741
1999 Cross-Sectional File Data Dictionary 1,437,781
1999 Cross-Sectional Data File247,019,472 10,946,868 10,946,775 19,643,796 57,393
Longitudinal File
Third Longitudinal File Data Dictionary1,2 1,881,358
Third Longitudinal File Data Dictionary Appendices (WordPerfect format) 173,300
Third Longitudinal Data File1,2 1,760,235,598 57,547,715 57,547,617 89,806,795 129,677
1The third longitudinal related data files contain data from the 1992, 1993, 1994, 1996, 1997, 1998, 1999, 2000, and 2001.
2A revised data dictionary and data file were released on March 7, 2006. In the previous SPD 3rd longitudinal file, people who permanently left the universe were incorrectly classified as "longitudinally non-interviewed." Zero weights were given to people who were qualified to be classified as longitudinally interviewed until they died or permanently moved outside the survey universe, and through the non-interview adjustment, others in the sample were weighted up to account for them. This error creates a bias by transferring the weights of these dead and out-of-universe people to the living, longitudinally interviewed sample people. Therefore, on the previous SPD 3rd longitudinal file, the longitudinally interviewed sample people represented incorrectly both the living people and the dead and out-of-scope people in the SPD/SIPP universe. From the estimation standpoint, the final weights on the previous SPD 3rd longitudinal file would produce substantial over-estimation of living people. On the current SPD 3rd longitudinal file, we have corrected this error by reweighting the file and classifying these people as longitudinally interviewed up until they came out of scope.
4The values for the NATVTY variable in the data dictionary are found in the natvty.txt file.
5Note that an updated data file was placed on this server on 4/06/2004. The file was revised to correct the variable IHHKEY0X.

Contact: (dsd_ferrett@census.gov) DataFerrett Help-Census/DSD/SMPB
Last modified: January 11, 2007
URL: http://www.bls.census.gov/ferretftp.htm