Suspect value

I've found a very suspect value in table B01002D, column B01002D_002, which is MEDIAN AGE BY SEX (ASIAN ALONE), for Males. In Placer County, CA, census tract 210.38, block group 4 (060610210384), the value for the median age is 115+. You can check it out here: factfinder.census.gov/.../0500000US06061.15000

This is the only median age value for any geography in the country greater than 99. I'll e-mail Census, and see if they have any further information.
Parents
  • From a strictly technical perspective, the MOE note states: "An '***' entry in the margin of error column indicates that the median falls in the lowest interval or upper interval of an open-ended distribution. A statistical test is not appropriate."

    The 2013 value for male median age for that tract is: 70.0 median (+/-94.7). Such a wide range implies an extraordinarily small sample size.

    But from a real-world perspective, it's hard to believe that tract has such a high median age. Satellite images show that most of the tract is your standard, suburban housing. There's a major apartment complex in the tract that advertises "after school programs."

    115+ would be a suspiciously high median even in a community entirely comprised of retirement residences or assisted-living facilities. In a run-of-the-mill suburban block group, I'm going to venture to suggest that it's a virtual impossibility.

    This case speaks clearly to the problems with ACS survey results at the smallest areas of geography (or for small population groups).

    Keep us posted on what you learn!
Reply
  • From a strictly technical perspective, the MOE note states: "An '***' entry in the margin of error column indicates that the median falls in the lowest interval or upper interval of an open-ended distribution. A statistical test is not appropriate."

    The 2013 value for male median age for that tract is: 70.0 median (+/-94.7). Such a wide range implies an extraordinarily small sample size.

    But from a real-world perspective, it's hard to believe that tract has such a high median age. Satellite images show that most of the tract is your standard, suburban housing. There's a major apartment complex in the tract that advertises "after school programs."

    115+ would be a suspiciously high median even in a community entirely comprised of retirement residences or assisted-living facilities. In a run-of-the-mill suburban block group, I'm going to venture to suggest that it's a virtual impossibility.

    This case speaks clearly to the problems with ACS survey results at the smallest areas of geography (or for small population groups).

    Keep us posted on what you learn!
Children
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