NBER CPS Supplements


CPS Supplement Files at NBER

This page contains an index to the NBER collection of Census/BLS format micro data files from the Current Population Survey. The collection includes many of the most interesting monthly surveys, but is not intended to be comprehensive. (Basic monthly data files are also available online.) Additions and replacements are subject to the needs of the NBER research program.

A housing unit in the CPS is interviewed for four consecutive months and then dropped out of the sample for the next eight months and is brought back in the following four months. So, when the system has been in operation for a full year, 4 of the 8 rotation groups will have been in the survey for the same month, 1 year ago. Matching information and Stata .do files from NBER Working Paper t0247 by B. Madrian and L. J. Lefgren are available for March-to-March matches and can be modified for use in other matches. Technical Paper 63 contains more information about Design and Methodology.

The following discussion assumes that you are familiar with the use of CPS tapes in other environments and deals only with the NBER specific information. You will certainly have to be familiar with a serious statistical package or programming language to make use of these files.

All the CPS data files are ASCII files compressed with the Unix compress command. You can decompress them with either the standard Unix uncompress command, DOS gzip, or Winzip. To check your ability to uncompress these files, download the small file compress.zip. This files give an example of how to read in .Z and .zip ASCII files into SAS for UNIX without decompressing the files. The compressed files are 15-20 Mb, and they expand to about 150-200 Mb.

SAS, SPSS, and Stata data definition file statements are available for some files. . To download files in Internet Explorer, right click on them and select "Save Target As...". If the pdf documents appear to be all blank pages or your screen just blinks, get the latest Acrobat Reader at www.abobe.com.

All of the data files use MS-DOS line ending conventions. That is, instead of just a line feed after each line (the Unix convention) there is a carriage return and a line feed (the DOS convention). This should not disturb any Unix programs, and makes the files more accessible to DOS software. It does change the record length for any program using fixed length records. Select here for more information, including a table listing the record length and the name of any supplements that may be included with the files.

Updates and changes.


All files use the naming convention:
cpsMMMYY.typ (MMM = month, YY = year)

NBER internal users can access the data on a UNIX system at /homes/data/cps or on an NBER PC via Network Neighborhood --> NBER --> home --> data --> cps

KEY

a = Data files (.zip)
p = PDF Documentation (.pdf)
d = DOC or TXT Documentation (.doc, .txt)
t = DDF catalogue files (.ddf)

The table is also color coded to indicate the supplement of each entry.

Annual Demographic File (March) Employee Benefit (Feb 90; May 83, 88; Apr 93) Fertility and Immigration (June)
Health and Benefits (Sep 94) Job Training (Jan 91-92) Work Schedules (May 91, 97, 01)
Pensions (May 1979) Schooling and Computers Tobacco Use (Sep 92, 95, 98; Jan 93, 96, 99, 00, 07; May 93, 96, 99, 00, Jun 01 03, Feb 02 03, Nov 01 03)
Occupational Mobility and Job Tenure School Enrollment (Oct 97-) Veteran's (Aug 95, 01, 03, 05; Sep 97, 99)
Voting and Registration (Nov 96, 98, 00, 02, 04, 06) Computer and Internet Use (Dec 98, Aug 00, Sep 01) Volunteer Workers (Apr 74, Sep 02-13)
Food Security (Dec 01-09 ; Apr 95, 97, 99, 01; Sep 96, 00; Aug 98) March/April Match: Child Support (Apr 92, 94, 96, 98, 00, 02) Lead Paint (Dec 94)  Telephone

Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
1962 Jan Feb a p
Part1
Part 2
Apr May Jun Jul Aug Sep Oct Nov Dec
1964 Jan Feb a p Apr May Jun Jul Aug Sep Oct Nov Dec
1966 Jan Feb a Apr May Jun Jul Aug Sep Oct Nov Dec
1967 Jan Feb a Apr May Jun Jul Aug Sep Oct Nov Dec
1968 Jan Feb a p Apr May Jun Jul Aug Sep Oct Nov Dec
1969 Jan Feb a Apr
a p
Jun Jul Aug Sep Oct Nov Dec
1970 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
1971 Jan Feb a Apr May Jun Jul Aug Sep Oct Nov Dec
1972 Jan Feb
a p
Apr May Jun Jul Aug Sep Oct Nov Dec
1973
a a
Feb a p Apr
a p
Jun Jul Aug Sep p Nov Dec
1974 Jan Feb a
a p
May Jun Jul Aug Sep Oct Nov Dec
1975 Jan Feb a Apr May Jun Jul Aug Sep Oct Nov Dec
1976 Jan Feb
a p
Apr p Jun Jul Aug Sep Oct Nov Dec
1977 Jan Feb
a p
Apr p p Jul Aug Sep
a p
Nov Dec
1978
a a
Feb
a p
Apr May Jun Jul Aug Sep
a p
Nov Dec
1979 Jan Feb
a p
Apr
a p
Jun Jul Aug Sep Oct Nov Dec
1980 Jan Feb
a p
Apr
a p
a p
Jul Aug Sep Oct Nov Dec
1981
a a
Feb
a p
Apr
a p
a p
Jul Aug Sep Oct Nov Dec
1982 Jan Feb
a p
Apr May
a p
Jul Aug Sep Oct Nov Dec
1983
a p
Feb
a p
Apr
a p
a p
Jul Aug Sep Oct Nov Dec
1984 a Feb
a p
Apr p
a p
Jul Aug Sep
a p
Nov Dec
1985 Jan Feb
a a
Apr p a Jul Aug Sep Oct Nov Dec
1986 a Feb
a p
Apr
a p
a p
Jul Aug Sep Oct Nov Dec
1987
a p
Feb
a p
Apr
a p
a p
Jul Aug Sep Oct Nov Dec
1988
a p
Feb
a
a
p
p
help
d
Apr
a p
a p
Jul Aug Sep Oct Nov Dec
1989 Jan Feb
a t
d Apr
a p
Jun Jul p Sep
a p
p Dec
1990
a p
a p
a t
Apr May
a p
Jul Aug Sep
a p
Nov Dec
1991
a p
Feb
a t
Apr
a p
Jun Jul Aug Sep
a p
Nov Dec
1992 a Feb
a t t
a p
May
a p
a p p
Aug
a p
a p t
Nov Dec
1993
a p
Feb
a p d
a p
a p p
Jun Jul Aug Sep
a p
Nov Dec
1994 Jan
a p
a p t
match
a p t
May
a p
Jul Aug
a t
a p
a p
a p t
1995 Jan
a p t
a t d
a t
p
a p t
Jul
a t
a p t
a p t
Nov Dec
1996
a p t
a p t
a p t
a p t
a p t
Jun Jul Aug
a p t
a p t
a p t
Dec
1997 Jan
a p t
a p t  pov
a p t
a p d
Jun Jul Aug
a p t
a p t
Nov Dec
1998 Jan
a p t
a p t  pov
a p t
May
a p t
Jul
a p t
a p t
a p t
a p t
a p t
1999
a p t
a p t
a p t  pov
a p t
a p t
Jun Jul Aug
a p t
a p t
Nov Dec
For 2000-Census based weights, 2002 NAICS-based industry codes, 2000 SOC-based occupation codes, and revised class of worker and union variables for 2000-2002 the CPS files, please visit CPS Extracts.
2000
a p t
a p t
a p t  pov hi
a p t
a p t
a p t
Jul
a p t
a p t
a p t
a p t
Dec
2001 Jan
a p t
a p t
SCHIP
 hi  pov
a p t
a p t
a p t
Jul
a p t
a p t
a p t
a p t
a p t
2002
a p t
a p t
a p t  hi  pov
a p t
May
a p t
Jul
a p t
a p t
a p t
a p t
a p t
Several major changes affected the 2003 CPS.   For more information about the changes, please visit CPS Extracts.
2003 Jan
a p t
a p t  hi  pov
Apr May
a p t
Jul
a p t
a p t
a p t
a p t
a p t
2004
a p t
a p t
Feb
a p t  pov  hi
a a a read t
a p t
a p t
a p t
Jul Aug
a p t
a p t
a p t
a p t
2005
Jan
a p t
a p t  pov  hi rw
Apr
a p t
Jun Jul
a p t
a p t
a p t
Nov
a p t
2006
a p t
Feb
a p t  pov  hi rw
a p t
a p t
a p t
Jul
a p t
a p t
a p t
a p t
a p t
2007
a p t
Feb
a p t  pov  hi rw
Apr May Jun Jul
a p t
a p t
a p t
Nov
a p t
2008
a p t
Feb
a p t  pov  hi rw
a p t
a p t
a p t
Jul
a p
a p t
a p t
a p t
a p t
a p t
2009
a p t
Feb
a p t  pov  hi rw
Apr May Jun Jul
a p
a p t
a p t
Nov
a p t
2010
a p t
Feb
a p t  pov  hi rw
a p
a p
a p
a p
a p
a p
a p
a p
a p
a p
2011
a p
Feb
a p t  pov rw
Apr May
a p
a p
a p
a p
a p
a p
a p
2012
a p
Feb
a p t  pov rw
a p
May
a p
a p
a p
a p
a p
a p
a p
2013 Jan Feb
a p t  pov rw
Apr May Jun Jul
a p
a p
a p
Nov Dec


Matched Files

Other CPS data

More CPS data is available at our data page:


To report problems or if you have comments or suggestions, e-mail Jean Roth at jroth@nber.org

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