Dear Ipums International forum,
I am looking at internal migration in the Mexico 1960 census, which is coded slightly differently from the censuses from 1990 onward.
I created a data extract with MIGRATEP (nature of migration), GEO1MIG_P (origin state), and GEO1_MX (present state).
If MIGRATEP == 20 (move to different state), then GEO1MIG_P should be different from GEO1_MX, since the person started in one state and moved to another state.
Yet I found a few rows where this is not true (see screenshot). There are 933 rows like this. My extract has 502,800 records.
I am thinking of dropping these rows, but I wonder if there is something I am missing here.