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Codebook for Assignment 7, Question 1 data 
Files houstondems.shp and sacdems.shp
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All data were downloaded from the 2016-2020 American Community Survey 
Units of observations: Census tracts in 2020 boundaries
houstondems.shp: Houston Metropolitan Area
sacdems.shp: Sacramento Metropolitan Area

Note: All tracts that have zero population sizes were removed
 
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Data Dictionary
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GEOID: Census Tract ID

nhblk: Number of non-Hispanic black - tract

nhwhite: Number of non-Hispanic white - tract

nhasn: Number of non-Hispanic Asian - tract

hisp: Number of Hispanic - tract

tpop: Total population - tract

pu18: Percent of residents under the age of 18 years old

p2234: Percent of residents between the ages of 22 and 34

pfb: Percent of residents who are foreign born

Metro: Metropolitan Area