Merged at MCD Group level.
County 053 - All precincts named by number have MCDGRP 029, except 26/503 - 26/554 which have MCDGRP 030.
There are large amounts of missing data in counties 033 and 063.
A number of counties (e.g., 9, 19, 29, etc.) have many more electoral precincts for 1990 than Census precincts. Rather than make these PLVDKEY 'exceptions,' these could have been left them alone. The rationale for this would be that while everything from the Census is included, not necessarily everything for the electoral precincts is included - hence a few unmatched electoral precincts will not cause as much inequality at the MCDgroup level as unmatched Census precincts will.
However, if one assumes that the county definitions are the same for both, and that the total number of people are the same within a given county, the extra electoral precincts HAVE TO belong to Census precincts that seemingly are exact matches with single electoral precincts. Given this assumption they were grouped together for these problematic counties.
MATH84WA Exceptions:
Counties 19, 29, 35, 45, 61, 69, 73
For county 61, all CENSPREC except CADET have MCDGRP 039. For county 73, all CENSPREC except POINT ROBERTS have MCDGRP 041.
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