Unmatched individuals when linking UKHLS to local authority data
I have recently added local authority level unemployment rates to a panel of individual-level UKHLS data (waves 1-9), using the Special License UKDA-6666 look-up file. I'm trying to understand the reasons why some individuals have not matched onto a local authority (given that hidp is non-missing). I understand that some households did not have valid postcodes. However, I noticed that 55% of the unmatched cases were in Northern Ireland (based on the gor_dv variable). Do you have an idea of why that might be the case?
Many thanks in advance,