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