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VCF0101 Respondent Age

QUESTION:
---------
1964-1976:  What is your date of birth?
1978-1982:  What is the month and year of your birth?
1984-LATER: What is the month, day and year of your birth?

VALID_CODES:
------------
17-96. Age as coded (1992:  91 is 91 or older)
97. 97 years old (1952, 1974, 1996 and later: or older)
98. 98 years old (1958-1962, 1966, 1968: or older)
99. 99 years old (1976-1990,1994,2002: or older)

MISSING_CODES:
--------------
00. NA; DK; RF; no Pre IW
Inap. question not used

NOTES:
------
GENERAL NOTE:
Prior to 1964 this appeared as a coded staff summary (not as a survey
question).
Except for 1968, in Pre-Post studies this variable is pre-election.
Beginning in 1964, age variables in ANES Study datasets were created by 
computing R's age from his/her given date of birth (beginning in 1988, 
when birthdate was not available, age as given for household listing by 
R/informant was used instead).  The age calculation used in these 
Study datasets determined age at date of interview  in 1966, 1968, 
1970, 1972 and 1980-1994; it represented age on November 1 of the year 
of interview in 1976 and 1978.  In 1974, age on election day  of the 
year of interview was calculated.  For 1964, no documentation is extant 
describing exact calculation made.
Prior to 1964, instead of age calculated using R's birthdate, age
as given by R/informant (this information may have come from the
coversheet) is represented.
1948 NOTE:
Age var was in the form of age groups and could not be included (see 
VCF0102).
1954 NOTE:
same as 1948.
1960 NOTE:
Personal data forms were completed for no-pre cases: data from these 
forms were incorporated into the (pre) age var listed.
1992 NOTE:
Birthdate was not asked in short-form interviews:  for panel 'short-
form' cases, 2 years were added to the age that appeared in the 1990 
study; for short-form 'fresh' cross-section cases, age was pulled from 
the coversheet.
2002 NOTE:
For panel cases, 2 years were added to the age (if determined) that 
appeared in the 2000 study.

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

TYPE:
-----
Numeric  Dec 0

SOURCE_VARS:
------------
1952:  520142  
1956:  560295
1958:  580174  
1960:  600122
1962:  620009  
1964:  640187
1966:  660192  
1968:  680533
1970:  700398(type 0)
1972:  720294
1974:  742406  
1976:  763369
1978:  780504  
1980:  800408
1982:  820535  
1984:  840429
1986:  860595  
1988:  880417
1990:  900552  
1992:  923903
1994:  941203  
1996:  960605
1998:  980572  
2000:  000908
2002:  023126x
2004:  043250


Walter Mebane 2005-11-03