COR 368a

                 Sibling Data Construction

SIBSIS--BOR

     In the recode statement, all people that had missing data on
SIBSIS also had missing data on SIBBRO. SIBBRO reflects sisters
and brothers ever born. SIBSIS, SIBBRO, SISOL, BROOL, SIBSTT and
BOR should therefore not be compared to the sib roster in Q77 of
the 1975 questionnaire.  BOR reflects R's position in the family
of ever born sibs (using SISOL and BROOL). They are all
constructed using Q74 and Q75 of the 1975 questionnaire.

SIBSLV

     This variable was constructed using the raw data tape's sib
roster (R not included in the roster). It is simply a counter of
sibs listed in Q77 of the 1975 questionnaire.  It is a counter of
living sibs and does not include R. If the entire roster has
missing data, then SIBSLV = 99. If the number of sibs could be
determined, even though each sib's data in the table was 77
(Don't know) or 99 (Not ascertained or nonrespondent), SIBSLV was
given a nonmissing value.

BORSIB

     Respondent's age at the time of the interview (TEMPOI) was
needed for constructing this variable. BORSIB was hand coded for
cases with missing ages in the sib roster. It was determined by
comparing SIBSTT, SISOL and BROOL. Those cases coded 99 did not
allow comparisons due to deaths of sibs since SIBSTT, SISOL and
BOR reflect ever born sibs and BORSIB reflects R's position among
currently living sibs. Hand coding was also done for a case where
R and another sib were the same age. It was computed by 
determining how recently R had turned the same age and by
comparing SIBSTT, SISOL and BROOL when possible. If R was a twin,
R was assigned a position older than the twin,

New Sibling Roster--Including R

     Construction of BORSIB is important in including R in the
sibling roster. R's age is calculated in constructing BORSIB
(TEMP01).  Only one respondent has missing data on age. R's
education was constructed using EDYRCM. Q93 gave us R's sex. 
Ages should be properly ordered in the table, from oldest sib in
the first position (R is in the first position if he/she is an
only child) to youngest sib. If BORSIB = 99 (not ascertained or
nonrespondent), the entire table was given 9's since R's correct
position in the table could not be determined. If the number of
sibs was known, although the table contained 9's and BORSIB = 99,
the roster was given 9's through the SIBSLV + 1 position. If R is
a twin, he/she was assigned a position before the twin (R was
assumed older).

IVRSBO

     There is no 55 twin code since R was considered older than
his/her twin.

SSBPOS

     This variable gives the selected sib's position in the table
when R is included in the table. 99 was used if BORSIB = 99 (R
cannot be included in the table), or the sibling selection number
(Q79) was 77 or 99 (don't know which should have been the
selected sib).  For twins, R was considered older than the twin. 

IVSSBR

     There is a separate twin code (55) so those coded 00 years
as an interval do not reflect the twins.