Census-Income Database

Data Type



This data set contains weighted census data extracted from the 1994 and 1995 current population surveys conducted by the U.S. Census Bureau. The data contains demographic and employment related variables.


Original Owner

U.S. Census Bureau
United States Department of Commerce


Terran Lane and Ronny Kohavi
Data Mining and Visualization
Silicon Graphics.
terran@ecn.purdue.edu, ronnyk@sgi.com
Date Donated: March 7, 2000

Data Characteristics

This data set contains weighted census data extracted from the 1994 and 1995 Current Population Surveys conducted by the U.S. Census Bureau. The data contains 41 demographic and employment related variables.

The instance weight indicates the number of people in the population that each record represents due to stratified sampling. To do real analysis and derive conclusions, this field must be used. This attribute should *not* be used in the classifiers.

More information detailing the meaning of the attributes can be found in the Census Bureau's documentation To make use of the data descriptions at this site, the following mappings to the Census Bureau's internal database column names will be needed:

age						AAGE
class of worker					ACLSWKR
industry code					ADTIND
occupation code					ADTOCC
adjusted gross income				AGI
education					AHGA
wage per hour					AHRSPAY
enrolled in edu inst last wk			AHSCOL
marital status					AMARITL
major industry code				AMJIND
major occupation code				AMJOCC
mace						ARACE
hispanic Origin					AREORGN
sex						ASEX
member of a labor union				AUNMEM
reason for unemployment				AUNTYPE
full or part time employment stat		AWKSTAT
capital gains					CAPGAIN
capital losses					CAPLOSS
divdends from stocks				DIVVAL
federal income tax liability			FEDTAX
tax filer status				FILESTAT
region of previous residence			GRINREG
state of previous residence			GRINST
detailed household and family stat		HHDFMX
detailed household summary in household		HHDREL
instance weight					MARSUPWT
migration code-change in msa			MIGMTR1
migration code-change in reg			MIGMTR3
migration code-move within reg			MIGMTR4
live in this house 1 year ago			MIGSAME
migration prev res in sunbelt			MIGSUN
num persons worked for employer			NOEMP
family members under 18				PARENT
total person earnings				PEARNVAL
country of birth father				PEFNTVTY
country of birth mother				PEMNTVTY
country of birth self				PENATVTY
citizenship					PRCITSHP
total person income				PTOTVAL
own business or self employed			SEOTR
taxable income amount				TAXINC
fill inc questionnaire for veteran's admin	VETQVA
veterans benefits				VETYN
weeks worked in year				WKSWORK

Note that Incomes have been binned at the $50K level to present a binary classification problem, much like the original UCI/ADULT database. The goal field of this data, however, was drawn from the "total person income" field rather than the "adjusted gross income" and may, therefore, behave differently than the orginal ADULT goal field.

Basic statistics for this data set

Number of instances in data = 199523
   Duplicate or conflicting instances : 46716
Number of instances in test = 99762
   Duplicate or conflicting instances : 20936
Number of attributes = 40 (continuous : 7 nominal : 33)

Data Format

One instance per line with comma delimited fields. There are 199523 instances in the data file and 99762 in the test file.

The data was split into train/test in approximately 2/3, 1/3 proportions using MineSet's MIndUtil mineset-to-mlc.

References and Further Information

Data Extraction System for the Census Bureau

The United States Census Bureau Web Site.

The UCI KDD Archive
Information and Computer Science
University of California, Irvine
Irvine, CA 92697-3425
Last modified: March 7, 2000.