US Population: Wrapped Facet

This chart visualizes the age distribution of the US population over time, using a wrapped faceting of the data by decade.

Method syntax

import altair as alt
from vega_datasets import data

source = data.population.url

alt.Chart(source).mark_area().encode(
    x='age:O',
    y=alt.Y('sum(people):Q').title('Population').axis(format='~s'),
    facet=alt.Facet('year:O').columns(5),
).properties(
    title='US Age Distribution By Year',
    width=90,
    height=80
)

Attribute syntax

import altair as alt
from vega_datasets import data

source = data.population.url

alt.Chart(source).mark_area().encode(
    x='age:O',
    y=alt.Y(
        'sum(people):Q',
        title='Population',
        axis=alt.Axis(format='~s')
    ),
    facet=alt.Facet('year:O', columns=5),
).properties(
    title='US Age Distribution By Year',
    width=90,
    height=80
)