On Apr 9, 2009, at 9:08 AM, Andy wrote:
> Do they actually knock on doors, or do they phone? I'm thinking of
> the cell phone problem.
<http://www.bls.gov/opub/hom/homch1_b.htm>
The CPS is collected each month from a probability sample of approximately 60,000 households. Respondents are assured that all information obtained is completely confidential and is used only for the purpose of statistical analysis. Although the survey is conducted on a strictly voluntary basis, refusals to cooperate amount to only about 4 percent each month. (Another 3 to 4 percent of eligible households are not interviewed because of other failures to make contact.)