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

.. _gallery_line_with_ci:


Line chart with Confidence Interval Band
========================================
This example shows how to make a line chart with a bootstrapped 95% confidence interval band.


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

    
    import altair as alt
    from vega_datasets import data

    cars = data.cars()

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

    confidence_interval = alt.Chart(cars).mark_area(opacity=0.3).encode(
        x='Year',
        y=alt.Y('ci0(Miles_per_Gallon)', axis=alt.Axis(title='Miles/Gallon')),
        y2='ci1(Miles_per_Gallon)'
    )

    confidence_interval + line


.. toctree::
   :hidden: