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"""
Grouped Bar Chart with Error Bars
---------------------------------
This example shows a grouped bar chart with error bars.
"""
# category: bar charts
import altair as alt
from vega_datasets import data
source = data.barley()
bars = alt.Chart().mark_bar().encode(
x='year:O',
y=alt.Y('mean(yield):Q', title='Mean Yield'),
color='year:N',
)
error_bars = alt.Chart().mark_errorbar(extent='ci').encode(
x='year:O',
y='yield:Q'
)
alt.layer(bars, error_bars, data=source).facet(
column='site:N'
)
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