Hi, I am working with Indonesian 2010 census and find that the number of observations born in birth years which are multiples of 5 is extremely larger than the other years.
For example, the number of observations born in 1959 is 231,827, while it’s 367,886 in 1960 and 205,861 in 1960. Similar pattern is found for other years, such as 1965, 1970.
I checked the person weight and found that person weight is the same for all observations in 2010 census.
I am attributing this to mis-reporting problem (that people may round up/down their birth years), is there any other specific reason? And is there any common way to deal with this problem?
Thanks a lot!