VCF0728 Media Exposure Count

QUESTION:
---------
Campaign media exposure count

VALID_CODES:
------------
1.  No media
2.
3.
4.
5.  All four media

MISSING_CODES:
--------------
0.  DK; NA; no Post IW; form II,III,IV (1972);
    abbrev. telephone IW (1984); short form or Spanish
    language (1992)
Inap. question not used

NOTES:
------
GENERAL NOTE:
This count is available for 1952, 1956, 1960, 1964, 1968, 1972, 1976,
1978, 1980, 1982, 1984 and 1992. It is constructed VCF0724-VCF0727 by 
summing the number of "yes" responses, plus 1.
All variables must be asked in a given year for this count to be
calculated:  however, if all vars are asked but all are coded DK/NA (0
in VCF0724-VCF0727), then VCF0728 is coded 0.  If at least 1 var is
coded with valid data during a year when all 4 questions are used by
NES, then this value is computed.

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

TYPE:
-----
Numeric  Dec 0

SOURCE_VARS:
------------
1952:  520173,520174,520175,520176
1956:  560196,560198,560199,560200
1960:  600190,600192,600193,600194
1964:  640279,640281,640282,640284
1968:  680292,680296,680299,680303
1972:  720456,720459,720461,720463
1976:  763600,763602,763604,763645
1978:  780044,780046,780056,780072
1980:  800745,800747,800849,800760,800761
1982:  820059,820060,820061,820062
1984:  840723,840725,840727,840728,840729,840730
1992:  923204,923206,923208,925103
1996:  960247,961002,961333,961335