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Scientific Data Documentation
Intercensal Population Estimates,Bureau of the Census, Ethnicity, 1981-1989

y8189.zip

Annoucement: January/February 1993
Abstract
Attachment
Record Layout

 ANNOUNCEMENT:  INTERCENSAL USAGE NOTES/NEWS


 Source:  APDU Newsletter
          Volume 17, No. 1
          January/February 1993


 Director Announces No Adjustment ofIntercensal Estimates

 Barbara Bryant, Director of the Bureau of the Census, announced on
 December 29 that the intercensal population estimates produced annually
 by the Bureau will not be adjusted to correct for the estimated 1.6%
 national net undercount in the 1990 census. This was one of the last 
 acts of Bryant, who left her position on January 20,1993. Harry Scarr, 
 Deputy Director, is now the senior official at the Census Bureau.

 "This decision was difficult to make," Bryant said in her notice 
 to the Federal Renter. "It is the consensus of a committee of senior 
 Census Bureau statisticians and demographers that adjustment would improve 
 the accuracy of the 1990 census count at the national level, particularly 
 for racial/ethnic and owner/renter groups. Adjustment would also more 
 accurately depict most states' shares of the national population. The 
 accuracy of the 1990 census is important to the intercensal adjustment issue 
 because the 1990 figure is the startmg point for our yearly population estimates. 
 However, because  the 1990 total undercount is so small (less than 2 percent), 
 it is impossible to accurately adjust for the 44,055 substate areas for which 
 population estimates are produced."

 Bryant noted that sponsors of federal surveys conducted by the Census
 Bureau will be offered the option of calibrating their surveys to adjusted or
 unadjusted population estimates beginnmg in 1993. These would be such surveys
 as the Current Population Survey, the National Health Interview Survey, and
 the National Crime Victimization Survey. These national surveys are
 calibrated at large, aggregate levels where Census Bureau research shows
 adjusted estimates are on average more accurate.

 Bryant also pointed out that unadjusted estimates remain the official
 population totals. Federal law requires that the Census Bureau issue official
 totals for use in any federal program which allocates its funding based upon
 population estimates.  The Census Bureau provides official population
 estimates to states and counties in every year between decenrialcensuses and
 to subcounty areas every other year. Estimates of US population as of July 1,
 1992, were released on January 1,1993.

 * Reprinted with permission of the Association of Public Data Users (APDU)
   For membership information contact:

                             Susan Anderson
                             (609) 258-6025 or
                             (609) 258-6052
 ABSTRACT

 Estimates of the Population of States by Age, Sex, Race, and Hispanic Origin:
 1981 to 1989

 These data are estimates of the population of the 50 States and
 the District of Columbia by 5-year age groups (age 0 to 4, 5 to
 9,...  85 and over) sex (male, female), and modified race (White;
 Black; American Indian, Eskimo, and Aleut; Asian and Pacific
 Islander) and Hispanic Origin (Hispanic Origin, non-Hispanic
 Origin) for each year, July 1, 1981 through July l, 1989.  These
 data are consistent with the following recently released
 estimates: I) revised estimates of the population of counties by
 age, sex, and race; 2) intercensal estimates of the population of
 states by age and sex; and 3) intercensal estimates of the
 population of the United States by age, sex, and race.

 The estimates included in this release are developed by
 interpolating the proportions of the population in specified
 race/ethnic categories developed from special census files for
 April 1, 1980 and 1990.  The interpolated proportions are applied
 to the appropriate annual state totals of revised estimates of
 the population of counties by age, sex, and race.  As a final
 step, the interpolated estimates are adjusted to be consistent
 with national intercensal estimates by specified race and
 ethnicity and the state intercensal estimates by age and sex.

 The age and race data in the 1980 and 1990 Census data files
 which were used as anchor points in this methodology were
 modified to be consistent with other data sets.  The 1980 census
 data were further modified to be consistent with the 1990
 definition of counties and the race modification procedures
 developed for 1990.  The race classifications were modified in
 the 1980 and 1990 census files.  The 1980 and 1990 census data
 included persons classified as "Other race".  These 
 people were not included in one of the specified racial categories 
 listed on the census form.  The existence of the "Other race" 
 category is inconsistent with race categories defined by the Office of
 Management and Budget in OMB Directive 15.  In order to serve the
 needs of the user community, it was necessary to assign each of
 these persons to a specified race.

 The age statistics for 1990 were modified to correspond with the
 April 1, 1990 census date.  A review of the detailed 1990 census
 information indicted that respondents tended to provide their age
 as of the date of completion of the questionnaire, not their age
 as of April I, 1990.  `In add= tion, there may have been a tendency
 for rospondents to round up their age if they were close to
 having a birthday.  The age data were modified to correspond to
 the April 1, 1990 date.

 The proportions by specified race developed from the special
 census files for 1980 and 1990 were interpolated to each July 1
 date, 1981 through 1989.  The interpolated proportions in each
 specified race/ethnic group were then applied to the appropriate
 state totals derived from the revised set of estimates of the
 population of counties by age, sex, and race; 1980 to 1989
 (documentation enclosed).  As a last step in the process, the
 interpolated estimates were adjusted to be consistent with
 revised intercensal estimates of the population of the nation by
 age, sex, and race; and the intercensal estimates of the
 population of states by age and sex.

 Separate data are shown on this computer diskette for each of the
 race/ethnic groups (White Hispanic, White non-Hispanic, Black
 Hispanic, Black non-Hispanic, American Indian, Eskimo, Aleut
 Hispanic, American Indian, Eskimo, Aleut non-Hispanic, Asian,
 pacific Islander Hispanic, and Asian Pacific Islander non-
 Hispanic).  However, the limitations of our methodology are such
 that we do not consider these data to be accurate for each
 individual cell.  We include the separate data for your convience
 in aggregating to various groups.  Although the data shown on
 this diskette are unrounded, we do not consister these data to be
 accurate to the last digit.
 ATTACHMENT

 Revised Estimates of the Population of Counties by Age, Sex, and Race:
 1980 to 1989

 These data are revised estimates of the Population of the 3,141
 counties in the United States as defined in 1990, by 5-year age
 groups (age 0 to 4, 5 to 9,,,,,,,85 and over), sex (male,
 female), and modified race (White, Black, other races) for each
 year, July 1, 1980 through July 1, 1989.  These data differ from
 the Preliminary estimates of the Population of counties by age,
 sex, and race available earlier this year.  These revised
 estimates are for counties as defined in 1990.  These estimates
 are also consistent with actual intercensal estimates for the
 Nation by age, sex, and race and the actual intercensal estimates
 for states by age and sex to be released later this year.

 The revised estimates included in this release are developed by
 interpolating between special census files for April 1, 1980 and
 1990.  The interpolations were adjusted to be consistent with:
 1) revised intercensal estimates of the population of the nation
 by age, sex, and race; 2) intercensal estimates of the
 population of states by age-and sex; and 3) intercensal estimates
 of the total population of counties.

 The age and race data in the 1980 and 1990 Census data files
 which were used as anchor points in this methodology were
 modified to be consistent with other data sets.  The 1980 census
 data were further modified to be consistent with the 1990
 definition of counties and the race modification Procedures
 developed for 1990.  The race Classifications were modified in
 the 1980 and 1990 census files.  The 1980 and 1990 census data
 included persons classified as "Other race".  These people 
 were not included in one of the specified racial categories listed on
 the census form.  The existence of the "Other race" category 
 is inconsistent with race categories defined by the Office of
 Management and Budget in OMB Directive 15.  In order to serve the
 needs of the user community, it was necessary to assign each of
 these persons to a specified race.

 The age statistics for 1990 were modified to correspond with the
 April 1, 1990 census date.  A review of the detailed 1990 census
 information indicated that respondents tended to provide their age
 as of the date of completion of the questionnaire, not their age
 as of April 1, 1990.  In addition, there may have been a tendency
 for respondents to round up their age if they were close to
 having a birthday.  The age data were modified to correspond to
 the April 1, 1990 date.

 The interpo1ations between the 1980 and 1990 modified census data
 were adjusted to be consistent with: 1) the intercensal estimates
 of the population of the nation by age, sex, and race; 2) the
 intercensal estimates of the population of states by age and sex;
 and 3) the intercensal estimates of the total population of
 counties. The intercensal estimates for the population of the
 nation by age, sex, and race, each state by age and sex, and
 total population of each county are consistent with both the 1980
 and 1990 censuses as enumerated.  The latest set of l980-based
 (postcensal) estimates totals and by age, sex, and race were
 applied to the intercensal formula described in appendix I.  All
 intercensal State estimates are adjusted to be consistent with
 the independent national intercensal estimates of population.
 All intercensal county estimates are adjusted to be consistent
 with the corresponding state estimates.
 RECORD LAYOUT

 General Information

 The data shown on this computer tape are unrounded.  However, the
 limitations of our methodology are such that we do not consider
 these data to be accurate to the last digit.

 Record Layout

            Contents                           Columns

 FIPS State Code                                1-2
 Year (Last digit, 1,2,...9)                    3
 Race/Hispanic Origin Code                      4
      1 White non-Hispanic
      2= Black non-Hispanic
      3 American Indian, Eskimo,
         Aleut, non-Hispanic
      4 Asian, Pacific Islander
         non-Hispanic
      5 White Hispanic
      6 Black Hispanic
       7  American Indian, Eskimo,
          Aleut, Hispanic
       8  Asian, Pacific Islander
          Hispanic
     Sex                                      5
       1  male
       2  female
     Age
      0-4                                       6-12
      5-9                                      13-19
      10-l4                                    20-26
      15-19                                    27-33
      20-24                                    34-40
      25-29                                    41-47
      30-34                                    48-54
      35-39                                    55-61
      40-44                                    62-68
      45-49                                    69-75
      50-54                                    76-82
      55-59                                    83-89
      60-64                                    90-96
      65-69                                    97-103
      70-74                                    104-110
      75-79                                    111-117
      80-84                                    118-124
      85+                                      125-131



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