As part of an analysis to determine the poverty rate exclusive of college and graduate students who do not live in group quarters, I created a 2010-14 ACS variable called PovStatusGQ, which splits the household and group quarters population into categories by housing type (household, group quarters) and poverty status (not evaluated for poverty, below threshold, above threshold). I followed the advice in the answer to the question from this past April about “Poverty and Group Quarters”, which states that persons with a GQ status of 4 or 5 and POVERTY status of greater than 0 should be included in the poverty calculation. This also appears to match the defintion provided in documentation available through the ACS web site.
When I run a simple table for the population of Cambridge, MA (statefip(25), puma(3200,0506)) using just the PovStatusGQ variable I can see that the analysis covers the entire population. Doing so yields an overall individual poverty rate of 14.6%. The 2010-14 ACS itself reports a poverty rate of 15.0%. The difference of 0.4%, while not large, was a bit more than I expected. Have I erred in some way in estimating the overall individual poverty rate?