File: histogram_with_a_global_mean_overlay.py

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"""
Histogram with a Global Mean Overlay
------------------------------------
This example shows a histogram with a global mean overlay.
"""
# category: distributions
import altair as alt
from vega_datasets import data

source = data.movies.url

base = alt.Chart(source)

bar = base.mark_bar().encode(
    alt.X('IMDB_Rating:Q').bin().axis(None),
    y='count()'
)

rule = base.mark_rule(color='red').encode(
    x='mean(IMDB_Rating):Q',
    size=alt.value(5)
)

bar + rule