Merging geographical special license data
I've merged two geographical special license datasets (SN7630 and SN7248) with the main dataset (SN6614) for each wave 1-9 using the variable hidp, but there appears to be more observations (hidps) in the special license datasets than the main dataset. Approximately 77% of observations across waves 1-9 are matched, 23% in special licence and not matched, and <1% in the main dataset and not matched.
I presume there's either an error in my code or a valid reason for this? Any help would be appreciated.
Updated by Alita Nandi about 2 years ago
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The geographical special license data files include households with valid postcodes including those that did not respond.
So, if you merge these geography files with w_hhsamp (households issued including non-responding households) then these would match except for the households in w_hhsamp without valid postcodes. But if you merge these geography files with w_hhresp, w_indall, w_indresp which include responding households only, then there will be households in the geography files that will not appear in these files.
Does this answer your question?