VCF0801 Thermometer Index: Liberal-Conservative

QUESTION:
---------
Liberal/conservative index

VALID_CODES:
------------
00.  Most liberal
.
49.  Neutral
.
97.  Most conservative

MISSING_CODES:
--------------
98.  DK in VCF0211 or VCF0212; don't recognize OR can't
     rate (1980 and later) in VCF0211 or VCF0212, or both
99.  NA; no Post IW; form III,IV (1972)
Inap. question not used

NOTES:
------
GENERAL NOTE:
This index is constructed from the thermometer score for liberals
(VCF0211) and the thermometer score for conservatives (VCF0212).
The calculation used is the following:  First, the value of VCF0211 is
subtracted from 97, and that difference is added to the value of
VCF0212.  This sum is then divided by 2, and .5 is added to the
result.  Finally, the solution is truncated to obtain an integer
value.  If either VCF0211 or VCF0212 is 98, then VCF0801 is coded 98;
99 is coded in VCF0801 if it is the only missing data value coded
in VCF0211,VCF0212.

WEIGHT:
-------
VCF0009/VCF0009a

TYPE:
-----
Numeric  Dec 0

SOURCE_VARS:
------------
1964:  640238,640251 
1966:  660120,660131
1968:  680225,680241 
1970:  700252,700242(type0)
1972:  720709,720724 
1974:  742358,742369
1976:  763823,763838 
1980:  800861,800877
1982:  820142,820143 
1984:  840770,840764
1986:  860150,860153 
1988:  880609,880616
1990:  900156,900161 
1992:  925319,925326
1994:  940306,940311 
1996:  961031,961032
1998:  980264,980267 
2000:  001310,001311
2002:  025057,025058
2004:  045062,045069