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"""
Top-K Plot with Others
----------------------
This example shows how to use aggregate, window, and calculate transfromations
to display the top-k directors by average worldwide gross while grouping the
remaining directors as 'All Others'.
"""
# category: advanced calculations
import altair as alt
from vega_datasets import data
source = data.movies.url
alt.Chart(source).mark_bar().encode(
alt.X("aggregate_gross:Q").aggregate("mean").title(None),
alt.Y("ranked_director:N")
.sort(op="mean", field="aggregate_gross", order="descending")
.title(None)
).transform_aggregate(
aggregate_gross='mean(Worldwide_Gross)',
groupby=["Director"],
).transform_window(
rank='row_number()',
sort=[alt.SortField("aggregate_gross", order="descending")],
).transform_calculate(
ranked_director="datum.rank < 10 ? datum.Director : 'All Others'"
).properties(
title="Top Directors by Average Worldwide Gross",
)
|
