If more than 50 percent of the precinct names in a county (1) currently lack MCDGRP values and (2) are simply not matchable by our most aggressive assumptions, then a county qualifies as an exception.
Also, even if 50 percent or more of the distinct PLVD precinct names have matches, if one or more MCD Group s from the Census side do not have any precinct matches, then the county must be an exception.
For an exception county, we have to renumber the MCD Group s. Hand-matching should not proceed until proper re-grouping is completed.
Not matchable means that there is no information in the Census precinct names for that county that corresponds to the text in the precinct names. For instance, the Census precincts may have full text names (e.g., Smith, Jones, Williams, etc.) and no numbers whatsoever, while the precincts may be just numbers (e.g., 1, 2, 3, etc.).
I also want to emphasize the county-specific nature of this problem. You must look at all precincts in a given county before you can make this decision. Count up the number of distinct precinct names. If more than half of those - not of those plus Census precinct rows! - are unmatchable, then you have an exception.
What you should look for are large numbers of contiguous rows with no MCD Group values. Less frequently, a county will have names on both sides, just ones that don't match. This will appear as a county with interleaved precincts, but with virtually no matches, every other line or so having a blank MCD Group field.
NOTE: Make a plain ASCII file that lists the exception
counties in a single column. Save it as xx.MGE in the state's
PLVD directory. For example, it could look like the following:
51
123
125
131
143
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