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ACS PUMS – How to Aggregate Sample Anthony Tersine US Census Bureau Census Information Center Meeting October 10, 2007 ACS PUMS - Sampling 2005 PUMS is limited to housing units and household population 2006 PUMS includes housing units, household population and the group quarters population

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acs pums how to aggregate sample

ACS PUMS – How to Aggregate Sample

Anthony Tersine

US Census Bureau

Census Information Center Meeting

October 10, 2007

acs pums sampling
ACS PUMS - Sampling
  • 2005 PUMS is limited to housing units and household population
  • 2006 PUMS includes housing units, household population and the group quarters population
multiyear pums files
Multiyear PUMS Files
  • Two approaches – both combine single year files
    • Adjust estimates at the end
    • Adjust weights at the beginning
method 1
Method 1
  • Concatenate single year files
  • Adjust dollar amounts for inflation
    • Express prior year dollars in terms of latest year dollars
adjust dollar amounts 1
Adjust Dollar Amounts – 1
  • First apply “ADJUST” variable within year
  • Apply the CPI-U-RS adjustment factors from BLS
  • http://www.bls.gov/cpi/cpiurs1978_2006.pdf
adjust dollar amounts 2
Adjust Dollar Amounts – 2
  • Express year 2005 dollars in terms of 2006 dollars
  • Values from the CPI-U-RS table for 2005 (286.7) and 2006 (296.1)
  • Multiply the 2005 dollars by 296.1/286.7 = 1.03279
adjust dollar amounts example
Adjust Dollar Amounts – Example
  • 2005-2006 person income in 2006 $
  • 2005 person record

PINC * (ADJUST / 1000000) * 1.03279

  • 2006 person record

PINC * (ADJUST / 1000000)

  • ADJUST – different values
method 1 tabulations
Method 1 –Tabulations
  • Use combined file as a single-year file
  • Adjust estimates based on number of years (M) combining
  • Create counts, means, medians, etc.
    • Create separate estimates for HU and GQ persons
  • Standard Errors
    • Replicate weights
    • Generalized variances
method 1 counts aggregates
Method 1 – Counts / Aggregates
  • All years have GQs or only interested in HU or household pop
method 1 counts aggregates10
Method 1 – Counts / Aggregates
  • Counts or aggregates - replicates
  • Counts only - generalized
method 1 counts aggregates11
Method 1 – Counts / Aggregates
  • Some (but not all) years have GQs
    • M is total number of years
    • N is the number of years with GQ data
method 1 counts aggregates12
Method 1 – Counts / Aggregates
  • Counts or aggregates – replicates
  • Counts – generalized
method 1 ratios
Method 1 – Ratios
  • All years have GQs or only interested in HU or household pop
method 1 ratios15
Method 1 – Ratios
  • Replicates
  • Proportion/percents only - generalized
method 1 ratios16
Method 1 – Ratios
  • Some (but not all) years have GQs
    • M is total number of years
    • N is the number of years with GQ data
method 1 ratios17
Method 1 – Ratios
  • Replicates
  • Proportion/percents only - generalized
method 1 medians
Method 1 – Medians
  • All years have GQs or only interested in HU or household pop
  • Normal median (X) on the combined data
  • Categorical median (Interpolated)
method 1 medians19
Method 1 – Medians
  • Replicates
  • Generalized – Can be done
method 1 medians20
Method 1 – Medians
  • Some (but not all) years have GQs
  • Use method 2
method 2
Method 2
  • Concatenate single year files
  • Adjust weights
  • Adjust dollar amounts for inflation
    • Same approach as method 1
adjust weights
Adjust Weights
  • Adjustment factor is the number of years being combined
  • Divide by the factor
adjust weights example 1
Adjust Weights – Example 1
  • 2005-2006 Estimate (PWGTP)
  • 2005 HU person - weight 50 becomes 25
  • 2006 HU person - weight 75 becomes 37.5
  • 2006 GQ person - weight 60 will stay 60
adjust weights example 2
Adjust Weights – Example 2
  • 2005-2007 Estimate (PWGTP)
  • 2005 HU person - weight 67 becomes 22.333333
  • 2006 HU person - weight 50 becomes 16.666667
  • 2007 HU person - weight 75 becomes 25
  • 2006 GQ person - weight 60 becomes 30
  • 2007 GQ person - weight 55 becomes 27.5
contact information
Contact Information

Anthony.G.Tersine.Jr@census.gov

Alfredo.Navarro@census.gov