:orphan:
:html_theme.sidebar_secondary.remove:

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

.. _gallery_histogram_with_a_global_mean_overlay:


Histogram with a Global Mean Overlay
------------------------------------
This example shows a histogram with a global mean overlay.


.. altair-plot::
    :remove-code:
    


    import altair as alt
    from vega_datasets import data

    source = data.movies.url

    base = alt.Chart(source)

    bar = base.mark_bar().encode(
        x=alt.X('IMDB_Rating:Q', bin=True, axis=None),
        y='count()'
    )

    rule = base.mark_rule(color='red').encode(
        x='mean(IMDB_Rating):Q',
        size=alt.value(5)
    )

    bar + rule


.. tab-set::

    .. tab-item:: Method syntax
        :sync: method

        .. code:: python


            import altair as alt
            from vega_datasets import data

            source = data.movies.url

            base = alt.Chart(source)

            bar = base.mark_bar().encode(
                alt.X('IMDB_Rating:Q').bin().axis(None),
                y='count()'
            )

            rule = base.mark_rule(color='red').encode(
                x='mean(IMDB_Rating):Q',
                size=alt.value(5)
            )

            bar + rule


    .. tab-item:: Attribute syntax
        :sync: attribute

        .. code:: python


            import altair as alt
            from vega_datasets import data

            source = data.movies.url

            base = alt.Chart(source)

            bar = base.mark_bar().encode(
                x=alt.X('IMDB_Rating:Q', bin=True, axis=None),
                y='count()'
            )

            rule = base.mark_rule(color='red').encode(
                x='mean(IMDB_Rating):Q',
                size=alt.value(5)
            )

            bar + rule