Transcript The Rise of Cohabitation in the United States: New

Using IPUMS.org
Katie Genadek
Minnesota Population Center
University of Minnesota
[email protected]
The IPUMS projects are funded by the National Science
Foundation and the National Institutes of Health
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Overview
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What is IPUMS?
Microdata and Summary Data
IPUMS-USA
IPUMS-CPS
Online Analysis System
Online Demonstration
Questions
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What is IPUMS?
Integrated - consistent codes, labels, and documentation
Public Use - anonymized, downloadable
Microdata - individual-level
Series - pooled data over time and place
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But, What is IPUMS Data?
Individual level:
Demographic Data
Census Data
Survey Data
Health Data
Historical Data
Migration Data
Time Use Data
Summary level:
Demographic Data
Census Data
Historical Data
Mapping Data
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MPC Data Projects
http://www.ipums.org/
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Microdata:
MICRODATA AND SUMMARY DATA
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Microdata versus Summary Data
Microdata
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Shows full range of
responses for
individuals
Enable custom tables
and sophisticated
analyses
Suppression:
geography,
truncation, and item
level suppression
Summary Data
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Premade or published
tables of aggregate
characteristics
Enable examination
of small geographic
areas
Suppression:
limited content,
grouped intervals,
and cell suppression
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Summary Data
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Age
Sex
Relationship
Race
Birthplace
Mother’s birthplace
Occupation
H910000240000000088001001000220100
P910000020101032120010010010011504
P910000010201036220010010010011999
P910201000301011220060010010011999
P910201000301009120060010010011999
P910201000301007120060010010011999
P910201000301006120060010010011999
P910201000301004220060010010011999
P910201000301003220060010010011999
P910201000301002220060010010011999
H910000240000000088001001000110100
P910000020101030110010290510511310
P910000010201021210010290290171999
P910201000301001110060010290291999
H910000240000000088001001000220100
P910000020101045120010010010011100
P910000010201025220010010010011820
P910201000301007220060010010011999
H910000240000000088001001000220100
P910000020101049120010010010011100
P910000010201049220010010010011820
P910201000301019220060010010011820
P910201000301015220060010010012820
IPUMS Data
Structure
Household record
(shaded) followed
by a person record
for each member
of the household
For each type of
record, columns
correspond to
specific variables
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Microdata Data:
IPUMS-USA
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IPUMS-USA
• Database includes public use microdata
samples:
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U.S. decennial censuses (1850-2000)
Complete-count dataset for 1880
Linked Samples 1850 – 1930
Samples from Puerto Rico (1910-2008)
American Community Survey (2000-2009)
• The first MPC data project
• Most widely used database ~ 30,000 users
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Census Samples
Census Year
Sample
Density
Number of persons in dataset
1850
1%
198,000
1860
1%
354,000
1870
1%
428,000
1880
100%
50,300,000
1900
6%
5,189,000
1910
1.4%
1,265,000
1920
1%
1,037,000
1930
5%
6,060,000
1940
1%
1,351,000
1950
1%
1,922,000
1960
1%
1,780,000
1970
6%
12,180,000
1980
9%
20,403,000
1990
6%
15,000,000
2000
6%
16,885,000
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The American Community Survey
• Replaced the long form of the Decennial
Census
– Demonstration stage: 2000 to 2004
– Full implementation 2005, group quarters added
2006
• Rolling sample design
Microdata samples:
• Full survey responses for 1% of US population
• Yearly samples, multi-year samples
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ACS Samples
Year
Sample
Density
Number of Persons in
dataset
2000
1 in 750
372,000
2001
1 in 230
1,200,000
2002
1 in 260
1,075,000
2003
1 in 230
1,200,000
2004
1 in 240
1,194,000
2005
1 in 100
2,878,000
2006
1 in 100
2,970,000
2007
1 in 100
3,100,000
2008
1 in 100
3,001,000
2009
1 in 100
3,030,700
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Census and ACS Variable Topics
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Basic demographic
Marriage
Family structure
Fertility
Ethnicity
Disability
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Education
Work
Income
Migration
Housing
Characteristics
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Geography Limitations
• No confidentiality restrictions for samples
prior to 1940 – no geographic limitation
• Samples from 1940-1970
– Limited and inconsistent geographic identifiers
• Recent samples:
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State
Some Metropolitan Areas
County Groups
Public Use Microdata Areas (PUMAs)
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What are PUMAs?
• Public Use Microdata Areas (PUMAs)
• Comprised of approximately 100,000 persons
• Boundaries do not always align with
jurisdictional boundaries
• Detailed contents and maps available
• GIS shape files for PUMAs available
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Microdata Data:
IPUMS-CPS
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Current Population Survey (CPS)
• Administered starting 1940
• Monthly survey administered by the Bureau
of Labor Statistics
• Household survey was designed to measure
unemployment
• Source of the official Government statistics on
employment and unemployment
• In 2009 - 57,000 households interviewed
monthly
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Current Population Survey
March Supplement
• All March respondents
• Additional respondents from February, March
and November monthly samples
• Data are collected for Armed Forces members
residing with their families
• March Annual Social and Economic Supplement
is the most widely used by social scientists and
policymakers
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Current Population Survey
March Supplement
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Labor force participation and unemployment
Work experience and educational attainment
Sources of income including non-cash benefits
Program participation
Tax filing status
Health Insurance
Migration
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IPUMS - CPS
• All March Data (Back to 1962)
• Basic Monthly Surveys
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Samples from 2000-2008 (back to 1976 soon)
Data for every month
~50,000 households surveyed each month
Less variables than March supplement
• Demographic information
• Family characteristics
• Employment status
• Education information
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Obtaining Data:
ONLINE ANALYSIS SYSTEM
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Online Analysis System
• High-speed tabulation software developed at
UC-Berkeley
• Allows for analysis of microdata without
statistical package
• All analysis performed online
• Can analyze multiple years of data
• Help guides on webpage
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Features
• Data analysis capabilities
– Frequencies and cross tabulations (including
charts)
– Comparisons of means (with complex std errors)
– Correlation matrix
– Comparisons of correlations
– Regression (ordinary least squares)
– Logit and probit regression
– List values of individual cases
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Where is this online tabulator?
• Follow the link ‘Analyze Data Online’ from
the homepage of:
– usa.ipums.org/usa/
– cps.ipums.org/cps/
• Select all samples of year of interest in USA
• Open IPUMS-USA or CPS in additional tab
for documentation
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Obtaining Data:
USE THIS DATA
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Microdata for Analysis
• Documentation is Important!!!
– Use the IPUMS documentation
– Be aware of top/bottom codes, NIU codes, and
missing data codes
– Know the universe – who got asked the
question
• Weights – makes estimates representative
– See additional weights presentation
• Sample size is important
– Check analysis without weights
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Microdata for Analysis
• Allows more complex analysis then
summary data
• Geographic Restrictions
– State Level Analysis
– Metro Area level Analysis
• Time series – change over time
• Not downloading tons of tables
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IPUMS is Awesome
• Comprehensive online documentation
• Integration makes analyzing change over time
possible
• Data analysis system allows you access the
data and analyze it online
• All of the data are available for free online
• User support is available by e-mail to help you
as needed
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Social Explorer - Shout Out
• Produces online maps and data reports
• Based on boundary files made available
through NHGIS
• Map changes in census data over time
• http://www.socialexplorer.com/
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Obtaining Data:
DISCUSSION OF “WEIGHTING” AND
ONLINE DEMO OF IPUMS
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Questions – email us
IPUMS User Support
[email protected]
Contact:
Katie Genadek
[email protected]
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