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25 lines
738 B
Python
25 lines
738 B
Python
"""
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Error Bars showing Confidence Interval
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======================================
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This example shows how to show error bars using confidence intervals.
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The confidence intervals are computed internally in vega by a non-parametric
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`bootstrap of the mean <https://github.com/vega/vega-statistics/blob/master/src/bootstrapCI.js>`_.
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"""
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# category: other charts
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import altair as alt
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from vega_datasets import data
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source = data.barley()
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error_bars = alt.Chart(source).mark_errorbar(extent='ci').encode(
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x=alt.X('yield:Q', scale=alt.Scale(zero=False)),
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y=alt.Y('variety:N')
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)
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points = alt.Chart(source).mark_point(filled=True, color='black').encode(
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x=alt.X('yield:Q', aggregate='mean'),
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y=alt.Y('variety:N'),
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)
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error_bars + points
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