blockGroupShp           Polygon layer of Dallas County, TX, census
                        block groups
bndShp                  Boundary of Dallas County, TX
foodDesertShp           Boundaries of three Neighorhoods in the City of
                        Dallas, TX
foodStoresShp           Point layer of Stores selling Food in Dallas
                        County, TX
hwyShp                  Major Highways in Dallas County, TX
lakesShp                Lakes in Dallas County, TX
lmHetero                Function: Multiplicately weighted regression
                        model
mapBiPolar              Function: Map a bipolar theme broken around a
                        neutral value
mapColorQual            Function: Maps a qualitative theme for a
                        maximum of 12 categories
mapColorRamp            Function: Maps a sequential color theme
plotBoxesByFactor       Layout of box-plots: variables by factor
summary.lmHetero        Function: Summerize lmHetero model estimates
tractShp                Polygon layer of Dallas County, TX, census
                        tracts
