An "*****" entry in the margin of error column

This is a very interesting table note to an ACS table.

 This table, of sex by age

https://data.census.gov/cedsci/table?t=Populations%20and%20People&g=0400000US36&d=ACS%205-Year%20Estimates%20Detailed%20Tables&tid=ACSDT5Y2018.B01001&hidePreview=true

 has **** in the margin of error column, and this note of explanation

 “An "*****" entry in the margin of error column indicates that the estimate is controlled. A statistical test for sampling variability is not appropriate.”

 

I’m not really sure what this means. Any help would be greatly appreciated!

 

Thanks

 Gene

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