IPUMS Extract Exercise Lisa Neidert Poverty/American Community Survey Workshop July

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

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

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

Variables  do do  Variables arranged by Subject General version Detailed version

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

Sample selections  Exclude incearn < 1

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

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

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\ipums_2009.dat'