Cumulative Count Chart

This example shows an area chart with cumulative count. Adapted from https://vega.github.io/vega-lite/examples/area_cumulative_freq.html

Method syntax

import altair as alt
from vega_datasets import data

source = data.movies.url

alt.Chart(source).transform_window(
    cumulative_count="count()",
    sort=[{"field": "IMDB_Rating"}],
).mark_area().encode(
    x="IMDB_Rating:Q",
    y=alt.Y("cumulative_count:Q").stack(False)
)

Attribute syntax

import altair as alt
from vega_datasets import data

source = data.movies.url

alt.Chart(source).transform_window(
    cumulative_count="count()",
    sort=[{"field": "IMDB_Rating"}],
).mark_area().encode(
    x="IMDB_Rating:Q",
    y=alt.Y("cumulative_count:Q", stack=False)
)