Empirical Cumulative Distribution Function

This example shows an empirical cumulative distribution function.

Method syntax

import altair as alt
from vega_datasets import data

source = data.movies.url

alt.Chart(source).transform_window(
    ecdf="cume_dist()",
    sort=[{"field": "IMDB_Rating"}],
).mark_line(
    interpolate="step-after"
).encode(
    x="IMDB_Rating:Q",
    y="ecdf:Q"
)

Attribute syntax

import altair as alt
from vega_datasets import data

source = data.movies.url

alt.Chart(source).transform_window(
    ecdf="cume_dist()",
    sort=[{"field": "IMDB_Rating"}],
).mark_line(
    interpolate="step-after"
).encode(
    x="IMDB_Rating:Q",
    y="ecdf:Q"
)
# No channel encoding options are specified in this chart
# so the code is the same as for the method-based syntax.