VCF1003 Relative Salience (Lik-Dis): Incumbent/Challger House Cands

QUESTION:
---------
Relative salience of Incumbent and challenger House candidates

MISSING_CODES:
--------------
999.MD (codes 6-9 in any of: VCF0993,VCF0994,
    VCF0997,VCF0998)
Inap. question not used

NOTES:
------
GENERAL NOTE:
Relative salience of incumbent and challenger House candidates is the
sum of 'likes' and 'dislikes' about the incumbent House candidate
MINUS the sum of 'likes' and 'dislikes' about the challenger House
candidate: [VCF0993+VCF0994] - [VCF0997+VCF0998], which is the same 
as:  VCF0996-VCF1000.

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

TYPE:
-----
Numeric  Dec 0

SOURCE_VARS:
------------
1980:  800892,800893,800894,800895,800896,800897,
       800898,800899,800900,800901,800902,800903,
       800904,800905,800906,800907,800908,800909,
       800910,800911  
1982:  820148,820149,820150,820151,820152,820153,
       820154,820155,820156,820157,820158,820159,
       820160,820161,820162,820163,820164,820165,
       820166,820167
1984:  840908,840909,840910,840911,840912,840913,
       840914,840915,840916,840917,840918,840919,
       840920,840921,840922,840923,840924,840925,
       840926,840927  
1986:  860184,860185,860186,860187,860188,860189,
       860190,860191,860192,860193,860194,860195,
       860196,860197,860198,860199,860200,860201,
       860202,860203  
1988:  880674,880675,880676,880677,880678,880679,
       880680,880681,880682,880683,880684,880685,
       880686,880687,880688,880689,880690,880691,
       880692,880693,880694,880695,880696,880697
1990:  900198,900199,900200,900201,900202,900203,
       900204,900205,900206,900207,900208,900209,
       900210,900211,900212,900213,900214,900215,
       900216,900217,900218,900219,900220,900221  
1992:  925401,925402,925403,925404,925405,925406,
       925407,925408,925409,925410,925411,925412,
       925413,925414,925415,925416,925417,925418,
       925419,925420,925421,925422,925423,925424  
1994:  940401,940402,940403,940404,940405,940406,
       940407,940408,940409,940410,940411,940412,
       940413,940414,940415,940416,940417,940418,
       940419,940420,940421,940422,940423,940424
1996:  961044,961045,961046,961047,961048,961049,
       961050,961051,961052,961053,961054,961055,
       961056,961057,961058,961059,961060,961061,
       961062,961063,961064,961065,961066,961067 
1998:  980275,980276,980277,980278,980279,980280,
       980281,980282,980283,980284,980285,980286,
       980287,980288,980289,980290,980291,980292,
       980293,980294,980295,980296,980297,980298 
2000:  001328,001329,001330,001331,001332,001333,
       001334,001335,001336,001337,001338,001339,
       001340,001341,001342,001343,001344,001345,
       001346,001347,001348,001349,001350,001351