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IPUMS Extract Exercise

IPUMS Extract Exercise. Lisa Neidert Poverty/American Community Survey Workshop June 23-27, 2008. Purpose of extracting data. Modeling Regressions, etc. Recodes In familiar statistical package. IPUMS. Same data we have used with PDQ-Explore Concatenated file 1850-2006

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IPUMS Extract Exercise

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  1. IPUMS Extract Exercise Lisa Neidert Poverty/American Community Survey Workshop June 23-27, 2008

  2. Purpose of extracting data • Modeling • Regressions, etc. • Recodes • In familiar statistical package

  3. IPUMS • Same data we have used with PDQ-Explore • Concatenated file • 1850-2006 • Can select one year or many • Final product is: • Data (compressed) • Codebook • Set-up statements

  4. Strategy • Do simple extract • Download • Uncompress data • Modify set-up statement • Produce means and regression in statistical package of choice • SAS, SPSS, stata • Go back and produce ‘real’ extract • Take time choosing variables

  5. Variables • http://usa.ipums.org/usa/VariableGroups.do • Variables arranged by Subject • General version • Detailed version

  6. Variables included in my extract • hhwt (default) • perwt (default) • age [25-54] • sex [males] • race [white, black] • incearn • poverty

  7. Sample selections • Exclude incearn < 1

  8. Recodes • L_Earn = Log(Incearn) • White (dummy variable) • A2 = Age*Age • Interaction terms (with white) • W_Age • W_Age2

  9. Download/Unzip data • If zipped file does not have an icon associated with it, your PC is missing software • Solution • Use my PC • Copy to gift flash drive

  10. Modify program • SAS wants you to identify: • Work area • Data location • Desktop location as a path is: • 'c:\Documents and Settings\lisan\Desktop’ • 'c:\Documents and Settings\lisan\ Desktop\lisan_umich_edu_078.dat'

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