32 lines
680 B
Python
32 lines
680 B
Python
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"""
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Scatter Plot with Rolling Mean
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------------------------------
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A scatter plot with a rolling mean overlay. In this example a 30 day window
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is used to calculate the mean of the maximum temperature around each date.
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"""
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# category: scatter plots
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import altair as alt
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from vega_datasets import data
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source = data.seattle_weather()
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line = alt.Chart(source).mark_line(
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color='red',
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size=3
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).transform_window(
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rolling_mean='mean(temp_max)',
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frame=[-15, 15]
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).encode(
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x='date:T',
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y='rolling_mean:Q'
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)
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points = alt.Chart(source).mark_point().encode(
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x='date:T',
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y=alt.Y('temp_max:Q',
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axis=alt.Axis(title='Max Temp'))
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)
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points + line
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