VCF1015 Date of Pre-Election IW: Number of Days Before Election

QUESTION:
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Number of days from Pre-election IW until day of election

VALID_CODES:
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Exact number of days is coded, except:

MISSING_CODES:
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99.  NA; no Pre IW; abbrev. Pre IW (1980, see
     VCF0015)
Inap. question not used

NOTES:
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See also VCF1016.
GENERAL NOTE:
studies are not designed to produce representative samples with respect 
time period.
1992 NOTE:
Two cases of interviews mistakenly coded 11/2/1992 in Study data should 
have been coded 11/3/1992 [election day but prior to voting]; the 
correct date has been used in the calculation here.
2004 NOTE:
When the beginning and ending date of pre interview are different, the 
ending date of pre interview (042010b) was used.

WEIGHT:
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VCF0009/VCF0009a

TYPE:
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Numeric  Dec 0

SOURCE_VARS:
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1952:  520010 
1956:  560009  
1960:  600012 
1964:  640014 
1968:  680022 
1972:  720022
1976:  763023 
1980:  800025 
1984:  840032 
1988:  880043,880044
1992:  923026,923027
1996:  960013 
2000:  000009  
2002:  022012d
2004:  042010a,042010b