Survey Weights and SPM Archive
Old Survey Weights
2020 and 2021 ASEC Weights Pre-2020 Update
In 2022, the Census Bureau released updated survey weights based on the 2020 population for the 2020 and 2021 ASEC files. IPUMS CPS weight variables contain the most up-to-date data.
The Census Bureau recommends using the 2020-Census Based weights when analyzing the 2020 and 2021 ASEC with the 2022 and later ASEC data and using the 2010 Census-based weights when comparing the 2020 and 2021 ASEC with previous years. IPUMS has provided the 2010 Census-based household, person, and replicate weights on this page for this purpose. For an explanation of the difference between these weight variables, see the comparability section of the ASECWT description.
The files in the table below may be merged to IPUMS CPS extracts using SERIAL, PERNUM, and YEAR as linking keys. The replicate weight values have two implied decimal places; users will need to divide weight values by 100 to achieve correct totals.
| 2010-Based Replicate Weight Files | ||
|---|---|---|
| File Type | 2020 ASEC Replicate Weights | 2021 ASEC Replicate Weights |
| CSV | oldrepwts2020-2010base.csv | oldrepwts2021-2010base.csv |
| Stata | oldrepwts2020-2010base.dta | oldrepwts2021-2010base.dta |
| SAS | oldrepwts2020-2010base.sas7bdat | oldrepwts2021-2010base.sas7bdat |
| SPSS | oldrepwts2020-2010base.sav | oldrepwts2021-2010base.sav |
2010 and 2011 ASEC Weights Pre-2010 Update
In 2012, the Census Bureau released updated survey weights based on the 2010 population for the 2010 and 2011 ASEC files. IPUMS CPS weight variables contain the most up-to-date data.
IPUMS CPS provides outdated data for user's reference. The files in the table below contain the ASEC survey weight (equivalent to ASECWT) and replicate weight data based on 2000 population counts.
The files in the table below may be merged to IPUMS CPS extracts using SERIAL, PERNUM, and YEAR as linking keys. The weight values have two implied decimal places; users will need to divide weight values by 100 to achieve correct totals.
| 2000-Based Replicate Weight Files | ||
|---|---|---|
| File Type | 2010 ASEC Weights | 2011 ASEC Weights |
| CSV | oldrepwts2010-2000base.csv | oldrepwts2011-2000base.csv |
| Stata | oldrepwts2010-2000base.dta | oldrepwts2011-2000base.dta |
| SAS | oldrepwts2010-2000base.sas7bdat | oldrepwts2011-2000base.sas7bdat |
| SPSS | oldrepwts2010-2000base.sav | oldrepwts2011-2000base.sav |
SPM Variables Pre-2014 Update
In 2014, the Census Bureau updated the SPM public use research files to reflect three changes. First, the 2010 and 2011 files include updated tax estimates. Second, all files use a revised estimate for WIC (see SPMWIC for more information). Third, all files use Census 2010-based population controls (see ASECWT for more information). IPUMS CPS makes available only the most up-to-date data. The files below provide the verision of the SPM data prior to these updates. Note that different variables were updated for each year.
Supplement Poverty Measures.
- For CPS ASEC 2012: SPMPOV, SPMWIC, SPMTOTRES, and SPMFEDTAXAC.
- For CPS ASEC 2011: SPMPOV, SPMWIC, SPMTOTRES, SPMFEDTAXAC, SPMFEDTAXBC, SPMEITC, SPMSTTAX, and SPMWT.
- For CPS ASEC 2010: SPMPOV, SPMWIC, SPMTOTRES, SPMFEDTAXAC, SPMFEDTAXBC, SPMEITC, SPMSTTAX, SPMFICA, SPMMEDXPNS, and SPMWT.
The files below contain the old SPM data for the 2010-2012 ASEC samples. These can be merged to IPUMS CPS extracts using SERIAL, PERNUM, and YEAR as linking keys. The SPM weight variable has two implied decimal places; users must divide these values by 100 to achieve correct totals.
| Pre- 2014 update SPM Variables | |||
|---|---|---|---|
| File Type | 2010 | 2011 | 2012 |
| CSV | oldSPM2010.csv | oldSPM2011.csv | oldSPM2012.csv |
| Stata | oldSPM2010.dta | oldSPM2011.dta | oldSPM2012.dta |
| SAS | oldSPM2010.sas7bdat | oldSPM2011.sas7bdat | oldSPM2012.sas7bdat |
| SPSS | oldSPM2010.sav | oldSPM2011.sav | oldSPM2012.sav |
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