_dta:
  1.  usracesingleagesadj set up by Jean Roth , jroth@nber.org , 2 Jan 2018
  2.  NBER URL: http://www.nber.org/data/seer_u.s._county_population_data.html
  3.  Source Page: https://seer.cancer.gov/popdata/download.html
  4.  Source File URL: seer.cancer.gov/popdata/yr1990_2016.singleages/us.1990_2016.singleages.adjusted.exe
  5.  Source Text File: us.1990_2016.singleages.adjusted.txt

  obs:    55,125,577                          
 vars:            10                          2 Jan 2018 14:32
 size: 1,102,511,540                          (_dta has notes)
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              storage   display    value
variable name   type    format     label      variable label
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year            int     %8.0g                 Year
st              str2    %9s                   State Postal Abbreviation
stfips          str2    %9s                   State FIPS code
county          str5    %9s                   County FIPS code
registry        byte    %30.0g     registry   Registry
race            byte    %29.0g     race       Race
hispanic        byte    %71.0g     hispanic   Hispanic Origin
sex             byte    %8.0g      sex        Sex
age             byte    %9.0g      age        Age
pop             long    %12.0g                Population
--------------------------------------------------------------------------------------------------------------------------------------------
Sorted by: year  county  age  race  sex
registry:
           1 San Francisco-Oakland SMSA 
           2 Connecticut 
          20 Detroit (Metropolitan) 
          21 Hawaii 
          22 Iowa 
          23 New Mexico 
          25 Seattle (Puget Sound) 
          26 Utah 
          27 Atlanta (Metropolitan) 
          29 Alaska Natives 
          31 San Jose-Monterey 
          33 Arizona Indians 
          35 Los Angeles 
          37 Rural Georgia 
          41 California excluding SF/SJM/LA 
          42 Kentucky 
          43 Louisiana 
          44 New Jersey 
          99 Registry for non-SEER area 
race:
           1 White 
           2 Black 
           3 American Indian/Alaska Native 
           4 Asian or Pacific Islander 
hispanic:
           0 Non-Hispanic 
           1 Hispanic 
           9 Not applicable in 1969-2004 W,B,O files, or 1981-2011 state-level files 
sex:
           1 Male 
           2 Female 
age:
          85 85+ years