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28 lines
675 B
Python
28 lines
675 B
Python
"""
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Bar Chart with Rolling Mean
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---------------------------
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A bar chart overlayed with a rolling mean. In this example the average of values over the previous decade is displayed as a line.
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"""
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# category: bar charts
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import altair as alt
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from vega_datasets import data
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source = data.wheat()
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bar = alt.Chart(source).mark_bar().encode(
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x='year:O',
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y='wheat:Q'
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)
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line = alt.Chart(source).mark_line(color='red').transform_window(
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# The field to average
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rolling_mean='mean(wheat)',
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# The number of values before and after the current value to include.
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frame=[-9, 0]
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).encode(
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x='year:O',
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y='rolling_mean:Q'
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)
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(bar + line).properties(width=600)
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