Master ID File
The CHNS Master ID File contains a single observation for every individual who ever participated in a CHNS Survey. It contains their more current household (HHID) and individual (LINE) ID, their date of birth as a lunar and western date, their gender, and their previous IDs (HHID/LINE) if they have participated as members of different households.
This file was created using the 1993 CHNS master as a baseline and using data from 1997 through 2009 to make additions and/or corrections. This file will be updated as more data are reviewed and as more data become available such as the 2011 CHNS survey data.
Special Note
A major difference in the new longitudinal files is that all Household IDs have been expanded from seven to nine digits. This change was done to expand the Neighborhood/Village identifier (T4) from one to two digits and to expand the Household identifier (T5) from two to three digits. All CHNS longitudinal files that have data in 2004 or later years will have a six-digit community ID and a nine-digit Household ID.
Information on Those Who Have Died
Information has been added regarding those whose deaths have been reported in one or more surveys. In the 55 cases where a death has been reported more than once, the first reported date is assumed to be the most accurate (unless missing) since it is the closest survey to the death.
Nationality
The nationality variable was created from variables AA7A, AA19A, AB2A, AC9, or AD7 and has been added to the Master ID File.
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