--------------------------------------------------------------------------------
Codebook for NHGIS data file 'nhgis1270_ts_geog2010_state'
--------------------------------------------------------------------------------
 
Contents
    - Data Summary
    - Data Dictionary
    - Geographic Integration Methods
    - Source Data
    - Citation and Use
 
Detailed notes on time series design and comparability are available at: 
    https://www.nhgis.org/sites/www.nhgis.org/files/nhgis_time_series_tables.pdf 
 
--------------------------------------------------------------------------------
Data Summary
--------------------------------------------------------------------------------
 
Time series layout:     Time varies by row
Geographic level:       State
Geographic integration: Standardized to 2010
Data measurement year:  1990
 
Tables:
 
1. Persons by Age [22]
   Selected year(s): 1990
   Code: CW3
 
--------------------------------------------------------------------------------
Data Dictionary
--------------------------------------------------------------------------------
 
Context Fields 
        GISJOIN:     GIS Join Match Code
        GEOGYEAR:    Geography Year
        DATAYEAR:    Data Measurement Year
        STATE:       State Name
        STATEA:      State Code
 
Table 1: (CW3) Persons by Age [22]
        CW3AA1990:   Persons: Under 5 years
        CW3AA1990L:  Lower bound: Persons: Under 5 years
        CW3AA1990U:  Upper bound: Persons: Under 5 years
        CW3AB1990:   Persons: 5 to 9 years
        CW3AB1990L:  Lower bound: Persons: 5 to 9 years
        CW3AB1990U:  Upper bound: Persons: 5 to 9 years
        CW3AC1990:   Persons: 10 to 14 years
        CW3AC1990L:  Lower bound: Persons: 10 to 14 years
        CW3AC1990U:  Upper bound: Persons: 10 to 14 years
        CW3AD1990:   Persons: 15 to 17 years
        CW3AD1990L:  Lower bound: Persons: 15 to 17 years
        CW3AD1990U:  Upper bound: Persons: 15 to 17 years
        CW3AE1990:   Persons: 18 and 19 years
        CW3AE1990L:  Lower bound: Persons: 18 and 19 years
        CW3AE1990U:  Upper bound: Persons: 18 and 19 years
        CW3AF1990:   Persons: 20 years
        CW3AF1990L:  Lower bound: Persons: 20 years
        CW3AF1990U:  Upper bound: Persons: 20 years
        CW3AG1990:   Persons: 21 years
        CW3AG1990L:  Lower bound: Persons: 21 years
        CW3AG1990U:  Upper bound: Persons: 21 years
        CW3AH1990:   Persons: 22 to 24 years
        CW3AH1990L:  Lower bound: Persons: 22 to 24 years
        CW3AH1990U:  Upper bound: Persons: 22 to 24 years
        CW3AI1990:   Persons: 25 to 29 years
        CW3AI1990L:  Lower bound: Persons: 25 to 29 years
        CW3AI1990U:  Upper bound: Persons: 25 to 29 years
        CW3AJ1990:   Persons: 30 to 34 years
        CW3AJ1990L:  Lower bound: Persons: 30 to 34 years
        CW3AJ1990U:  Upper bound: Persons: 30 to 34 years
        CW3AK1990:   Persons: 35 to 39 years
        CW3AK1990L:  Lower bound: Persons: 35 to 39 years
        CW3AK1990U:  Upper bound: Persons: 35 to 39 years
        CW3AL1990:   Persons: 40 to 44 years
        CW3AL1990L:  Lower bound: Persons: 40 to 44 years
        CW3AL1990U:  Upper bound: Persons: 40 to 44 years
        CW3AM1990:   Persons: 45 to 49 years
        CW3AM1990L:  Lower bound: Persons: 45 to 49 years
        CW3AM1990U:  Upper bound: Persons: 45 to 49 years
        CW3AN1990:   Persons: 50 to 54 years
        CW3AN1990L:  Lower bound: Persons: 50 to 54 years
        CW3AN1990U:  Upper bound: Persons: 50 to 54 years
        CW3AO1990:   Persons: 55 to 59 years
        CW3AO1990L:  Lower bound: Persons: 55 to 59 years
        CW3AO1990U:  Upper bound: Persons: 55 to 59 years
        CW3AP1990:   Persons: 60 and 61 years
        CW3AP1990L:  Lower bound: Persons: 60 and 61 years
        CW3AP1990U:  Upper bound: Persons: 60 and 61 years
        CW3AQ1990:   Persons: 62 to 64 years
        CW3AQ1990L:  Lower bound: Persons: 62 to 64 years
        CW3AQ1990U:  Upper bound: Persons: 62 to 64 years
        CW3AR1990:   Persons: 65 to 69 years
        CW3AR1990L:  Lower bound: Persons: 65 to 69 years
        CW3AR1990U:  Upper bound: Persons: 65 to 69 years
        CW3AS1990:   Persons: 70 to 74 years
        CW3AS1990L:  Lower bound: Persons: 70 to 74 years
        CW3AS1990U:  Upper bound: Persons: 70 to 74 years
        CW3AT1990:   Persons: 75 to 79 years
        CW3AT1990L:  Lower bound: Persons: 75 to 79 years
        CW3AT1990U:  Upper bound: Persons: 75 to 79 years
        CW3AU1990:   Persons: 80 to 84 years
        CW3AU1990L:  Lower bound: Persons: 80 to 84 years
        CW3AU1990U:  Upper bound: Persons: 80 to 84 years
        CW3AV1990:   Persons: 85 years and over
        CW3AV1990L:  Lower bound: Persons: 85 years and over
        CW3AV1990U:  Upper bound: Persons: 85 years and over
 
--------------------------------------------------------------------------------
Geographic Integration Methods
--------------------------------------------------------------------------------
 
1990 Block Data Standardized to 2010 Geography:

    NHGIS standardizes the 1990 data in these time series tables to 2010 census
    geography in two steps, first allocating census counts from 1990 census
    blocks to 2010 census blocks and then summing the reallocated 1990 counts
    for all 2010 blocks that lie within each target 2010 unit. In cases where a
    1990 block may intersect multiple 2010 units, NHGIS applies interpolation to
    estimate how 1990 block characteristics are distributed among the
    intersecting 2010 blocks, primarily using the population and housing
    densities of 2000 and 2010 blocks to model the distribution of 1990
    characteristics within 1990 blocks.
    
    For details on the interpolation model, see:
    https://www.nhgis.org/documentation/time-series/1990-blocks-to-2010-geog

Complete documentation on time series integration methods is available at:
    https://www.nhgis.org/documentation/time-series
 
--------------------------------------------------------------------------------
Source Data
--------------------------------------------------------------------------------
 
Additional documentation on NHGIS data sources is available at:
    https://www.nhgis.org/documentation/tabular-data

Table 1: (CW3) Persons by Age [22]
 
    Time series AA: Persons: Under 5 years
        Year: 1990
            Source geographic level: Block (by State--County--Tract)
            Source dataset: 1990 Census: STF 1 - 100% Data
                Source table: NP11. Age
                    Universe: Persons
                        Variable: [ET3001] Under 1 year
                        Variable: [ET3002] 1 and 2 years
                        Variable: [ET3003] 3 and 4 years
 
    Time series AB: Persons: 5 to 9 years
        Year: 1990
            Source geographic level: Block (by State--County--Tract)
            Source dataset: 1990 Census: STF 1 - 100% Data
                Source table: NP11. Age
                    Universe: Persons
                        Variable: [ET3004] 5 years
                        Variable: [ET3005] 6 years
                        Variable: [ET3006] 7 to 9 years
 
    Time series AC: Persons: 10 to 14 years
        Year: 1990
            Source geographic level: Block (by State--County--Tract)
            Source dataset: 1990 Census: STF 1 - 100% Data
                Source table: NP11. Age
                    Universe: Persons
                        Variable: [ET3007] 10 and 11 years
                        Variable: [ET3008] 12 and 13 years
                        Variable: [ET3009] 14 years
 
    Time series AD: Persons: 15 to 17 years
        Year: 1990
            Source geographic level: Block (by State--County--Tract)
            Source dataset: 1990 Census: STF 1 - 100% Data
                Source table: NP11. Age
                    Universe: Persons
                        Variable: [ET3010] 15 years
                        Variable: [ET3011] 16 years
                        Variable: [ET3012] 17 years
 
    Time series AE: Persons: 18 and 19 years
        Year: 1990
            Source geographic level: Block (by State--County--Tract)
            Source dataset: 1990 Census: STF 1 - 100% Data
                Source table: NP11. Age
                    Universe: Persons
                        Variable: [ET3013] 18 years
                        Variable: [ET3014] 19 years
 
    Time series AF: Persons: 20 years
        Year: 1990
            Source geographic level: Block (by State--County--Tract)
            Source dataset: 1990 Census: STF 1 - 100% Data
                Source table: NP11. Age
                    Universe: Persons
                        Variable: [ET3015] 20 years
 
    Time series AG: Persons: 21 years
        Year: 1990
            Source geographic level: Block (by State--County--Tract)
            Source dataset: 1990 Census: STF 1 - 100% Data
                Source table: NP11. Age
                    Universe: Persons
                        Variable: [ET3016] 21 years
 
    Time series AH: Persons: 22 to 24 years
        Year: 1990
            Source geographic level: Block (by State--County--Tract)
            Source dataset: 1990 Census: STF 1 - 100% Data
                Source table: NP11. Age
                    Universe: Persons
                        Variable: [ET3017] 22 to 24 years
 
    Time series AI: Persons: 25 to 29 years
        Year: 1990
            Source geographic level: Block (by State--County--Tract)
            Source dataset: 1990 Census: STF 1 - 100% Data
                Source table: NP11. Age
                    Universe: Persons
                        Variable: [ET3018] 25 to 29 years
 
    Time series AJ: Persons: 30 to 34 years
        Year: 1990
            Source geographic level: Block (by State--County--Tract)
            Source dataset: 1990 Census: STF 1 - 100% Data
                Source table: NP11. Age
                    Universe: Persons
                        Variable: [ET3019] 30 to 34 years
 
    Time series AK: Persons: 35 to 39 years
        Year: 1990
            Source geographic level: Block (by State--County--Tract)
            Source dataset: 1990 Census: STF 1 - 100% Data
                Source table: NP11. Age
                    Universe: Persons
                        Variable: [ET3020] 35 to 39 years
 
    Time series AL: Persons: 40 to 44 years
        Year: 1990
            Source geographic level: Block (by State--County--Tract)
            Source dataset: 1990 Census: STF 1 - 100% Data
                Source table: NP11. Age
                    Universe: Persons
                        Variable: [ET3021] 40 to 44 years
 
    Time series AM: Persons: 45 to 49 years
        Year: 1990
            Source geographic level: Block (by State--County--Tract)
            Source dataset: 1990 Census: STF 1 - 100% Data
                Source table: NP11. Age
                    Universe: Persons
                        Variable: [ET3022] 45 to 49 years
 
    Time series AN: Persons: 50 to 54 years
        Year: 1990
            Source geographic level: Block (by State--County--Tract)
            Source dataset: 1990 Census: STF 1 - 100% Data
                Source table: NP11. Age
                    Universe: Persons
                        Variable: [ET3023] 50 to 54 years
 
    Time series AO: Persons: 55 to 59 years
        Year: 1990
            Source geographic level: Block (by State--County--Tract)
            Source dataset: 1990 Census: STF 1 - 100% Data
                Source table: NP11. Age
                    Universe: Persons
                        Variable: [ET3024] 55 to 59 years
 
    Time series AP: Persons: 60 and 61 years
        Year: 1990
            Source geographic level: Block (by State--County--Tract)
            Source dataset: 1990 Census: STF 1 - 100% Data
                Source table: NP11. Age
                    Universe: Persons
                        Variable: [ET3025] 60 and 61 years
 
    Time series AQ: Persons: 62 to 64 years
        Year: 1990
            Source geographic level: Block (by State--County--Tract)
            Source dataset: 1990 Census: STF 1 - 100% Data
                Source table: NP11. Age
                    Universe: Persons
                        Variable: [ET3026] 62 to 64 years
 
    Time series AR: Persons: 65 to 69 years
        Year: 1990
            Source geographic level: Block (by State--County--Tract)
            Source dataset: 1990 Census: STF 1 - 100% Data
                Source table: NP11. Age
                    Universe: Persons
                        Variable: [ET3027] 65 to 69 years
 
    Time series AS: Persons: 70 to 74 years
        Year: 1990
            Source geographic level: Block (by State--County--Tract)
            Source dataset: 1990 Census: STF 1 - 100% Data
                Source table: NP11. Age
                    Universe: Persons
                        Variable: [ET3028] 70 to 74 years
 
    Time series AT: Persons: 75 to 79 years
        Year: 1990
            Source geographic level: Block (by State--County--Tract)
            Source dataset: 1990 Census: STF 1 - 100% Data
                Source table: NP11. Age
                    Universe: Persons
                        Variable: [ET3029] 75 to 79 years
 
    Time series AU: Persons: 80 to 84 years
        Year: 1990
            Source geographic level: Block (by State--County--Tract)
            Source dataset: 1990 Census: STF 1 - 100% Data
                Source table: NP11. Age
                    Universe: Persons
                        Variable: [ET3030] 80 to 84 years
 
    Time series AV: Persons: 85 years and over
        Year: 1990
            Source geographic level: Block (by State--County--Tract)
            Source dataset: 1990 Census: STF 1 - 100% Data
                Source table: NP11. Age
                    Universe: Persons
                        Variable: [ET3031] 85 years and over
 
--------------------------------------------------------------------------------
Citation and Use of NHGIS Data
--------------------------------------------------------------------------------
 
All persons are granted a limited license to use this documentation and the
accompanying data, subject to the following conditions:

* REDISTRIBUTION: You will not redistribute the data without permission.

  You may publish a subset of the data to meet journal requirements for accessing 
  data related to a particular publication. Contact us for permission for any other 
  redistribution; we will consider requests for free and commercial redistribution.

* CITATION: You will cite NHGIS appropriately.

    * Publications and research reports employing NHGIS data (either tabular or GIS) 
      should include the following citation:

        Steven Manson, Jonathan Schroeder, David Van Riper, Tracy Kugler, and Steven Ruggles. 
        IPUMS National Historical Geographic Information System: Version 17.0 
        [dataset]. Minneapolis, MN: IPUMS. 2022. 
        http://doi.org/10.18128/D050.V17.0

    * For policy briefs, online resources, or articles in the popular press, we 
      recommend that you cite the use of NHGIS data as follows:

        IPUMS NHGIS, University of Minnesota, www.nhgis.org.

These terms of use are a legally binding agreement. You can use the data only in 
accordance with these terms, and any other use is a violation of the agreement. 
Violations may result in revocation of the agreement and prohibition from using other 
IPUMS data. If IPUMS or our partners are harmed from your violation, you are 
responsible for all damages, including reasonable attorney's fees and expenses.
        
In addition, we request that users send us a copy of any publications, research
reports, or educational material making use of the data or documentation.

Send electronic material to: nhgis@umn.edu

Printed matter should be sent to:

    IPUMS NHGIS
    Institute for Social Research and Data Innovation
    University of Minnesota
    50 Willey Hall
    225 19th Ave S
    Minneapolis, MN 55455
