Measles example¶

Download this notebook from GitHub (right-click to download).

This notebook reproduces a visualization by the Wall Street Journal about the incidence of measles over time, which the brilliant Brian Granger adapted into an example for the Altair library.

Most examples work across multiple plotting backends, this example is also available for:

Bokeh measles_example

In [1]:

import numpy as np
import holoviews as hv
import pandas as pd
from holoviews import opts

hv.extension('matplotlib')
hv.output(fig='svg')

Declaring data¶

In [2]:

url = 'https://raw.githubusercontent.com/blmoore/blogR/master/data/measles_incidence.csv'
data = pd.read_csv(url, skiprows=2, na_values='-')

yearly_data = data.drop('WEEK', axis=1).groupby('YEAR').sum().reset_index()
measles = pd.melt(yearly_data, id_vars=['YEAR'], var_name='State', value_name='Incidence')

heatmap = hv.HeatMap(measles, label='Measles Incidence')
aggregate = hv.Dataset(heatmap).aggregate('YEAR', np.mean, np.std)

vline = hv.VLine(1963)
marker = hv.Text(1964, 800, 'Vaccine introduction', halign='left')

agg = hv.ErrorBars(aggregate) * hv.Curve(aggregate)

Plot¶

In [3]:

(heatmap + agg * vline * marker).opts(
    opts.HeatMap(aspect=1.4,invert_yaxis=True, show_values=False, show_frame=False,
                 labelled=[], xaxis=None, logz=True),
    opts.Layout(aspect_weight=1, fig_size=300, vspace=0, sublabel_format=None),
    opts.Overlay(aspect=3, show_title=False, bgcolor='white', 
                 show_legend=False, show_frame=False, xrotation=90),
    opts.VLine(color='black', ylim=(0, 1050))).cols(1)

Out[3]:

Download this notebook from GitHub (right-click to download).