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Codebook for Assignment 4 data file phil_tracts.shp
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Building code violation data were downloaded from the Philadelphia open data portal.
Demographic and economic data were downloaded from the 2012-2016 American Community Survey.
Tracts with a 0 population were removed from the file.
Units of observations: Census tracts in 2010 boundaries.

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Data Dictionary
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OBJECTID: 	ID
STATEFP10:	State FIPS code
COUNTYFP10:	County FIPS code
TRACTCE10:	Tract FIPS code 
GEOID10:	Complete FIPS tract ID
totpop:		Total population 2012-2016
mhhinc:		Median household income 2012-2016
mrent:		Median monthly rent 2012-2016
mhval:		Median housing value 2012-2016
pnhwhite:	Percent non-Hispanic white 2012-2016
pnhblk:		Percent non-Hispanic black 2012-2016
pnhasian:	Percent non-Hispanic Asian 2012-2016
phisp:		Percent Hispanic 2012-2016
pcol:		Percent with college degree 2012-2016
ppa:		Percent of adults on public assistance 2012-2016
punemp:		Percent of civilian labor force that are unemployed 2012-2016
pvac:		Percent of housing units that are vacant 2012-2016
phnew:		Percent of housing units built 2014 and after 2012-2016
ph70:		Percent of housing units built before 1970 2012-2016
ppov:		Percent below poverty line 2012-2016
lmhhinc:	Log median household income 2012-2016
popd:		Population density 2012-2016
lpop:		Log total population 2012-2016.  
lmhval:		Log median housing value 2012-2016
usarea:		Number of major building code violations per area in square miles 
		2015-2017