Hello and Happy Holidays!
I am using the new 2015 5-Year Data set to update numbers using the Income, Minority and Language ACS Files. When I ran the income numbers for Essex County Massachusetts Census Blocks, I used two data sources: "household income in the past 12 months (B19001)" and "Median Household Income in the last 12 months (B19013). Unfortunately B19013 is missing some Census Blocks (26 to be specific). 6 of those Census Blocks are missing from our specific region. Has anyone run across this in their work? We have a small region, so I have to run the numbers by Census Blocks to get at the specific info we're looking for.
Thanks to Angie for pointing out the missing data.
And thanks to Mark for suggesting that it might be due to a change in suppressing rules for median incomes in 2015 - I was not aware of this change and it is important information!
I was curious to see if I could replicate Angie's results and, if so, what the median income and MOEs were in 2014 for the missing block groups.
I found similar results - table B19013 for Essex County MA has 13 fewer block groups (534 versus 547) than B19001 for the same year or than B19013 for 2014. Angie reported 26 missing block groups but I think this may come from AFF row count comparisons that have two rows for each block group.
Of the 13 missing block groups, 5 had MOEs larger than the estimate in the 2014 version of table B19013.
So Mark's hypothesis that it might be due to the new suppression rule seems plausible. Additional evidence: the 2014 table had 16 block groups where the MOE was larger than the estimate and the 2015 table does not have any.
However, if the values were suppressed because of large MOEs, why isn't there any annotation? The rows are just missing - no annotation is present for these block groups. Census really should include annotation if these data values are being suppressed.