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Why is there such a big gap in Shenzhen census?

The reasons for the big gap in Shenzhen census are as follows:

1, the floating population statistics are inaccurate. Shenzhen is an immigrant city. Many people live and work in Shenzhen, but they have not settled in Shenzhen. These people may be omitted or counted repeatedly, resulting in inaccurate statistics.

2. The data reported by residents is untrue. In the census, some residents may fill in false information, such as age, household registration and marital status, which leads to inaccurate census data.

3. The census method is not perfect. There may be some defects in the methods used in the census, such as not conducting a comprehensive survey of the whole population and not conducting a comprehensive statistics of special groups, which will also lead to inaccurate data.

4. The statistical caliber is different. The statistical caliber of the census may be different, such as whether it includes migrants, Hong Kong, Macao and Taiwan residents, etc. This will also lead to data gaps.