Using Cohort Analysis Method to Assess the Quality of Census Data

Cohort analysis method is an important demographic research method. People who are born in the same year, called a birth cohort, who married in the same year called a birth marry cohort , or students graduated in the same year, and so on. This article according to the China 1990 born cohort, analysis the situation of this born cohort in the fifth census and sixth census, through comparison cohort analysis concluded the quality of data, thereafter analysis causes of exists differences. To guarantee correctly to utilization census data, avoid low quality data caused to scientific research. Found in the process of analyzing the data there is a significant relationship between age specific sex ratio and total population sex ratio, and use this formula for decomposition of sex ratio at birth and the elderly population sex ratio influence on total sex ratio of the population. It is concluded that the aging of population is the main factors to reduce our country's population sex ratio, but not the birth population sex ratio in the leading role.