demogr
id: individual identification number (ID) weight: individual post-sampling weight (with mean = 1) dbirth: respondent's date at birth in exact years since January 1, 1900 dint: date at the interview in exact years since January 1, 1900 (March 2004 for all respondents) d1marr: date at marriage (if any) in exact years since January 1, 1900. If NA, the individual has never been married before the interview. dch1: date at marriage (if any) in exact years since January 1, 1900. If NA, the individual is childless at the interview. sex: respondent's sex (factor w/2 levels: "Male", "Female") edu: respondent's level of education (factor w/3 levels: "low_sec","upp_sec","tert")
Dates in exact years have been computed considering the midpoint of a specific month. Thus, March 1995 means March 15, 1995 and the date in exact years is 95+2.5/12=95.21.
Impicciatore R. and Billari F.C., (2010), MAPLES: a general method for the estimation of age profiles from standard demographic surveys (with an application to fertility), DEAS WP, http://ideas.repec.org/p/mil/wpdepa/2010-40.html