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Scientific Data Documentation
Postcensal Population Estimates, Demo-Detail 1990-1992
DSN: CC36.CENSUS.POSTCEN.Y9092.DEMODETL


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ABSTRACT

METHODOLOGY FOR 1991 AND 1992 AGE-RACE-SEX COUNTY ESTIMATES

 Introduction

 The 1991 and 1992 county estimates are based on the 1990
 census counts,  as modified by the Census bureau in its MARS file.
 The estimates provide data for the White, Black,  Indian,  and Asian
 populations, by sex,  for 5-year age groups (0-4,  5-9,  10-14,  etc.
 to 85+). An additional project provides similar data for Spanish.

 The race modification carried out by the Census Bureau in the
 MARS file assigned those persons who did not indicate a specific
 race on their census form (approximately 9.8 million) to White,
 Black,  Indian,  or Asian.   Most of these persons were of Spanish
 heritage,  and were assigned chiefly to the White population.   The
 Bureau also modified the age distributions, most notably for the
 population under 5 years of age.

 Estimation Procedure

 1. Race estimates  (White, Black,  and Other)  for each county
    in 1990 were obtained by bringing the 1980 census figures
    forward with data on births,  deaths,  and estimated migration
    (internal and international).   By controlling these estimates to
    1990 census data, migration estimates for the decade consistent
    with both the 1980 and 1990 censuses were obtained.

 2.  Projections of births and deaths by race for 1990-95 were
     prepared.   The projections were controlled to agree with the
     Census Bureau's national birth projections, middle series,  in
     Current Population Reports, Series P-25, No.1092.

 3.  Population projections by race to 1995 were prepared using
     the 1980-90 migration rates.   The projections were controlled to
     agree with the Bureau's national population projections,  and to be
     consistent with their 1991 estimates of the total population of
     each county.   The Asian population was estimated as a proportion
     of the "Other" races,  the residual being American Indians.

 4.  The age and sex distribution in 1995 for each county was 
     obtained using Demo-Detail's Alternative procedure as described in
     professional paper "A Preliminary Comparison of Demo-Detail's
     County Estimates by Age and Sex with the 1990 Census", presented
     at the annual meeting of the Southern Demographic Association,
     October 1991, available on request.

     The estimates for 1990,  1991 and 1992  (July 1) were obtained by 
     interpolation between the data for April 1,  1990 and July 1,  1995,  
     controlling them to the Bureau's national estimates by age,  sex and 
     race in Series P-25, No.1104,  and to their 1991 estimates of the total 
     population of each county. This produced the final estimates for White, 
     Black,  Indian and Asian, by age and sex.
 RECORD LAYOUT

                       Tape Record Layout

    COUNTY AGE-SEX-RACE ESTIMATES (Total,White,Black,Asian):  1990-1992

   Character                               Item

 1                                   Blank
 2-3                                 FIPS State Code
 4-6                                 FIPS County Code
 7-18                                County Name
 19-24                               4/1/90 Total Male     0-4 years
 25-30                                                     5-9 years
 31-36                                                     10-14 years
 37-42                                                     15-19 years
 43-48                                                     20-24 years
 49-54                                                     25-29 years
 55-60                                                     30-34 years
 61-66                                                     35-39 years
 67-72                                                     40-44 years
 73-78                                                     45-49 years
 79-84                                                     50-54 years
 85-90                                                     55-59 years
 91-96                                                     60-64 years
 97-102                                                    65-69 years
 103-108                                                   70-74 years
 109-114                                                   75-79 years
 115-120                                                   80-84 years
 121-126                                                   85 yrs & over
 127-234                                     Total Female     (repeat)
 235-342                                     White Male          "
 343-450                                     White Female        "
 451-558                                     Black Male          "
 559-666                                     Black Female        "
 667-774                                     Asian Male          "
 775-882                                     Asian Female        "
 883-1746                            7/1/90    (repeat)
 1747-2610                           7/1/91       "
 2611-3474                           7/1/92       "
 (no CR/LF)

 Note: American Indian population can be obtained by subtraction.




This page last reviewed: Thursday, January 28, 2016
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