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Data Services Knowledge Base:
Reference: Clarification Questions

  1. I have funny results for the distribution of education using 1950 IPUMS data. What am I doing wrong?
  2. What does data defined person mean? It is an item in the microdata for 2000.
  3. What is the difference in the standard occupational classification system over time?
  4. I have an excel file that I want to join to an Arcmap template. My file has a 'previous sample' column that has 1 and 0 values in it. Every time I try to do the join the 'previous sample' variable is not listing in my attributes table. What is going on?
  5. The 2007 ACS data were released today. How long will it take for us to get the microdata?
  6. The codebook for the 1972-2006 GSS does not agree with the data. The weight variables are noted as being in columns 6982-6993 and yet the data only goes to column 6801.
  7. I am trying to get a sense of the American Community Survey (ACS). It is harder than I would have thought. Am I correct in thinking that annually they survey approximately 3,000K households per year? Are the samples independent of each other - e.g., 2005 and 2006? Finally, they do not seem to ask about country of birth. This seems odd although you might be able to make an estimate with ancestry and citizenship.
  8. I am generating some age-specific counts for various neighborhoods to compare with data in the Research Data Center (RDC). However, I am having trouble getting these counts to agree with what previous workers on this project have generated. Can you take a look at my numbers vs the project counts for our neighborhoods?
  9. I am looking at the life history calendar for the Chitwan Valley (Nepal) study data. The total number of observations listed is 5,271, but there are only 1,469 observations in the life history data. What is the solution?
  10. Can I access data from ICPSR from my home PC? My home computer is not part of the university IP pool.
  11. I am using microdata from the 2000 Census of Population and Housing. I have found some families with a code of "0" on family income. Is this an error on the part of the Census Bureau? If not, what is the explanation?
  12. I have a zip code file that has all zip codes in the nation that I am merging to a person file. When I look at the merged file I see that there is no zip code information for the respondents who live in zip code 48103, which is a valid zip code. Why didn’t the merge work?
  13. Do you know if the 1960 census asks the same ‘where did you live 5 years ago’ question that was asked in 1970-2000?
  14. I am working with NELS data (base year, first follow-up and second follow-up). When I tried to extract the variables from raw data using the SAS setup cards provided by ICPSR, I do not get the right number of cases – way too few.
  15. I was looking at the variables in the Collaborative Psychiatric Epidemiology Surveys (CPES) and I need to know how pregnant women are identified in the surveys. Also, how many pregnant women are in the samples?
  16. I downloaded a US Census Extract recently and have been running some descriptive statistics. In terms of race, Brazilian median household income immigrants mostly identify as white, "some other race" and "two or more races". I would like to find out how they classified in the latter 2 categories. Is there any way I can do this? Also, if it is just a matter of creating an extract with specific variables (e.g. "OTHER", NUMRACE), would it be possible to add these variables to my existing dataset? Or would I need to do a completely new data extract with all of the variables?
  17. I am having trouble reading a file into SAS. SAS is complaining about the last variable in each record. If I look at it with an editor, it looks like a ^M.