I am attempting to study intermetro migration rates longitudinally, from 2005 till the most recently available data. Of course, in 2012 they discontinued releasing the MIGMET variable, but I was able to generate one using the crosswalk IPUMS provided.
Looking at my migration variable though across time, there seems to be a shift in the values in 2012 from 2011, which is likely either generated by something in the data or something I’ve done wrong. I’m mostly asking whether intermetro migration should be comparable before and after 2012, or whether something changed in the new definition of PUMAs that would make data from those two periods not directly comparable.
I define intermetro migration by assessing whether the individual 1. Moved, 2. Weren’t in an unidentified area in either year and 3. Whether their current metro does not match their past metro. Using that definition for all years, the rate of intermetro migration is consistently around 1 percent lower after 2012, making me worry there’s something different in the denominator I’m not accounting for.
Saying the two periods aren’t comparable would actually be a welcome answer, because I’m pulling my hair out trying to figure out what I could have done wrong.