:orphan:
:html_theme.sidebar_secondary.remove:

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

.. _gallery_line_with_ci:


Line Chart with Confidence Interval Band
----------------------------------------
How to make a line chart with a bootstrapped 95% confidence interval band.


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


    import altair as alt
    from vega_datasets import data

    source = data.cars()

    line = alt.Chart(source).mark_line().encode(
        x='Year',
        y='mean(Miles_per_Gallon)'
    )

    band = alt.Chart(source).mark_errorband(extent='ci').encode(
        x='Year',
        y=alt.Y('Miles_per_Gallon', title='Miles/Gallon'),
    )

    band + line


.. tab-set::

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

        .. code:: python


            import altair as alt
            from vega_datasets import data

            source = data.cars()

            line = alt.Chart(source).mark_line().encode(
                x='Year',
                y='mean(Miles_per_Gallon)'
            )

            band = alt.Chart(source).mark_errorband(extent='ci').encode(
                x='Year',
                y=alt.Y('Miles_per_Gallon').title('Miles/Gallon'),
            )

            band + line


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

        .. code:: python


            import altair as alt
            from vega_datasets import data

            source = data.cars()

            line = alt.Chart(source).mark_line().encode(
                x='Year',
                y='mean(Miles_per_Gallon)'
            )

            band = alt.Chart(source).mark_errorband(extent='ci').encode(
                x='Year',
                y=alt.Y('Miles_per_Gallon', title='Miles/Gallon'),
            )

            band + line