.. This document is auto-generated by the altair-gallery extension. Do not modify directly.

.. _gallery_aggregate_bar_chart:


Horizontal Aggregate Bar Chart
------------------------------
This example is a bar chart showing the distribution of US population
by age in the year 2000.


.. altair-plot::
    :code-below:

    
    import altair as alt
    from altair.expr import datum

    from vega_datasets import data
    pop = data.population.url

    alt.Chart(pop).mark_bar().encode(
        x=alt.X('sum(people):Q', axis=alt.Axis(title='population')),
        y='age:O'
    ).properties(
        height=300,
        width=300
    ).transform_filter(
        datum.year == 2000
    )


.. toctree::
   :hidden: