| 摘 要： | 1. Introduction Population databases contain information about people and the conditions surrounding them. This information can be obtained from population censuses, demographic surveys, or vital registrations. Since the 1950s, we have conducted five censuses and many sampling surveys on population in China. Millions of dollars have been spent to produce data, but these data cannot be shared. Though population data abound at present, it does not necessarily mean that information is being ful…
|
