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The 2001 Census PUMFS Odyssey

The 2001 Census PUMFS Odyssey. Sponsored by HAL and PALS Presented by Chuck Humphrey. Release of the Individuals File. The individuals public use microdata file from the 2001 Census was announced in The Daily on Tuesday, February 8, 2005. Household & Family Releases.

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The 2001 Census PUMFS Odyssey

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  1. The 2001 Census PUMFS Odyssey Sponsored by HAL and PALS Presented by Chuck Humphrey

  2. Release of the Individuals File The individuals public use microdata file from the 2001 Census was announced in The Daily on Tuesday, February 8, 2005.

  3. Household & Family Releases The households file is projected for a June 2005 release, while the families file is slated for Fall 2005.

  4. Why Three Census PUMFs? • The reason that three separate public use files are being created for the 2001 Census is to guard against disclosure, while providing the user community with rich data representing different units of analysis from the census. • The practice of separate files for families, households and individuals has been used with several censuses: 2001, 1996, 1991, 1986, 1976 and 1971. The 1981 Census only has two files: individuals and a combined family & household file.

  5. A Quick Review of Units • At the 2002 Atlantic DLI workshop, we discussed the importance of the units of observation and analysis. • The unit of observation consists of the entities in primary research about which data are systematically collected. • The unit of analysis consists of the entities about which generalizations are to be made based upon an analysis. • The unit of observation and the unit of analysis are the same when the generalizations being made from a statistical analysis are attributed to the unit of observation.

  6. Three Files, Three Units • The three Census PUMF files represent three units of observation: individuals, families and households. The variables for each file are descriptive of the unit and context that they represent. • These three files consist of separate samples. Consequently, cases cannot be matched across files. • The files are samples from the 20% survey of the population (Form 2B).

  7. Essential Documentation • 2001 Census Public Use Microdata File: Individual File User Documentation • Location on the DLI FTP site: census/2001/Pumf/Individuals-Particuliers/english/doc/pdf/ • File name: user-documentation.pdf • Table of Contents Chapter I: Record Layout Chapter II: Description of Variables Chapter III: Sampling Method and Data Quality Chapter IV: Other Factors Affecting Data Reliability Appendix A: Economic and Census Family Membership and Family Status Appendix B: Conversion Factors

  8. Documentation Highlights • The only levels of geography included are selected CMA’s and all provinces and territories. • The codes of a few cases have been changed to Not Available for selected variables for confidentiality reasons. • Lower and upper income limits were imposed, which is well discussed in Chapter IV, Other Factors Affecting Data Reliability. • In 2001 religion is available (last asked in the 1991 Census) and two new variables were included: birthplace of parents and language of work.

  9. Documentation Highlights • There are total of 138 variables. • The file contains 13 variables providing context about the household type and dwelling characteristics. • Five variables describe the family context. • There are 24 variables dealing with ethnicity. • Twenty-three variables address knowledge and use of languages. • A total of 29 variables cover education and work characteristics. • Eighteen variables deal with income and its sources.

  10. Documentation Highlights • The individual file is a 2.7% sample of the target population, which includes Canadian citizens and landed immigrant (at home and abroad) and non-permanent residents living in Canada. • The target population does not include institutional residents, residents of incompletely enumerated Reserves and foreign residents. • The samples for post-censual surveys were drawn and removed from the pool of cases before the selection of the sample of individuals for this PUMF. • The file contains 801,055 cases.

  11. Documentation Highlights • The cases are weighted in the individual file and these weights are needed for population estimates and analyses. Unlike the weights with earlier Census individual files, the 2001 weights also adjust for other characteristics in the sampling process. • For example, the weight in the individual file in 1996 was a constant: 36. • Weight in 2001 range between 35 and 39 with decimal placements.

  12. Recommended Reading • Chapter III is highly recommended reading. It contains a series of examples that we’ll try to replicate in SPSS and describes the use of weights for estimation and sampling variability.

  13. Heads-up Comments • First, the SPSS command file for the individual file on the DLI FTP is incomplete. I had to use SPSS file off the CD. • Second, neither the SPSS command file from the CD or the DLI FTP specify the number of decimal places for the weight variable on the Data List command (should be six). • Third, two of the examples in Chapter III don’t match our version of the data file.

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