addIndexCase            Highlight index case at 40 Broad Street.
addKernelDensity        Add 2D kernel density contours.
addLandmarks            Add landmarks.
addNeighborhood         Add expected neighborhood polygons
addPlaguePit            Add plague pit (Marshall Street).
addPump                 Add water pump by numerical ID.
addSnow                 Adds Snow's graphical annotation of the Broad
                        Street pump walking neighborhood.
addVoronoi              Add Voronoi cells.
addWhitehead            Add Rev. Henry Whitehead's Broad Street pump
                        neighborhood.
anchor.case             Anchor or base case of each stack of
                        fatalities.
border                  Numeric IDs of line segments that create the
                        map's border frame.
caseLocator             Locate case by numerical ID.
cholera-package         cholera: amend, augment and aid analysis of
                        John Snow's cholera map
classifierAudit         Test if case is orthogonal to segment.
euclideanDistance       Compute the Euclidean distance between cases
                        and/or pumps.
fatalities              Amended Dodson and Tobler's cholera data.
fatalities.address      "Unstacked" amended cholera data with address
                        as unit of observation.
fatalities.unstacked    "Unstacked" amended cholera fatalities data
                        with fatality as unit of observation.
fixFatalities           Fix apparent coding errors in Dodson and
                        Tobler's digitization of Snow's map.
nearestPump             Compute shortest walking distances or paths.
neighborhoodData        Compute network graph of roads, cases and
                        pumps.
neighborhoodVoronoi     Compute Voronoi pump neighborhoods.
neighborhoodWalking     Compute walking path pump neighborhoods.
ortho.proj              Orthogonal projection of observed cases onto
                        road network.
ortho.proj.pump         Orthogonal projection of 13 original pumps.
ortho.proj.pump.vestry
                        Orthogonal projection of the 14 pumps from the
                        Vestry Report.
plague.pit              Plague pit coordinates.
plot.classifier_audit   Plot result of classifierAudit().
plot.euclidean_distance
                        Plot the Euclidean distance between cases
                        and/or pumps.
plot.time_series        Plot aggregate time series data from Vestry
                        report.
plot.voronoi            Plot Voronoi neighborhoods.
plot.walking            Plot method for neighborhoodWalking().
plot.walking_distance   Plot the walking distance between cases and/or
                        pumps.
print.classifier_audit
                        Return result of classifierAudit().
print.euclidean_distance
                        Summary of euclideanDistance().
print.time_series       Print summary data for timeSeries().
print.voronoi           Print method for neighborhoodVoronoi().
print.walking           Print method for neighborhoodWalking().
print.walking_distance
                        Print method for walkingDistance().
pumpCase                Numeric case IDs by pump neighborhood.
pumpData                Compute pump coordinates.
pumpLocator             Locate water pump by numerical ID.
pumps                   Dodson and Tobler's pump data with street name.
pumps.vestry            Vestry report pump data.
regular.cases           "Expected" cases.
road.segments           Dodson and Tobler's street data transformed
                        into road segments.
roadSegments            Reshape 'roads' data frame into 'road.segments'
                        data frame.
roads                   Dodson and Tobler's street data with appended
                        road names.
segmentLength           Compute length of road segment.
segmentLocator          Locate road segment by ID.
sim.ortho.proj          Orthogonal projection of simulated "expected"
                        cases onto road network.
sim.pump.case           List of "simulated" fatalities grouped by
                        walking-distance pump neighborhood.
simulateFatalities      Generate simulated fatalities and their
                        orthogonal projections.
snow.neighborhood       Snow neighborhood fatalities.
snowColors              Create a set of colors for pump neighborhoods.
snowMap                 Plot John Snow's cholera map.
snowNeighborhood        Plotting data for Snow's graphical annotation
                        of the Broad Street pump neighborhood.
streetLength            Compute length of selected street.
streetNameLocator       Locate road by name.
streetNumberLocator     Locate road by numerical ID.
timeSeries              Aggregate time series fatality data from the
                        Vestry report.
unitMeter               Convert nominal map distance to yards or
                        meters.
unstackFatalities       Unstack "stacks" in Snow's cholera map.
walkingDistance         Compute the shortest walking distance between
                        cases and/or pumps.
