I found that there are a number of PUMA codes in the ACS (100, 101, …) that are assigned to ALL states. In other words, I have various households (serial) in all U.S. states assigned to the PUMA code 100 (and 101 etc.)–this odd duplication of PUMAs is the case for a significant portion of my data set.
(I am aware that PUMAs are not unique. It is of course fine that certain PUMAs are assigned to two areas in different states.)
Is there something wrong with my data set? Is there a special significance to certain PUMA codes (i.e. 100)?
Thank you in advance.