1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
|
"""
US Population by Age and Sex
============================
This chart visualizes the age distribution of the US population over time.
It uses a slider widget that is bound to the year to visualize the age
distribution over time.
"""
# category: case studies
import altair as alt
from vega_datasets import data
source = data.population.url
select_year = alt.selection_point(
name="Year",
fields=["year"],
bind=alt.binding_range(min=1900, max=2000, step=10, name="Year"),
value={"year": 2000},
)
alt.Chart(source).mark_bar().encode(
x=alt.X("sex:N", axis=alt.Axis(labels=False, title=None, ticks=False)),
y=alt.Y("people:Q", scale=alt.Scale(domain=(0, 12000000)), title="Population"),
color=alt.Color(
"sex:N",
scale=alt.Scale(domain=("Male", "Female"), range=["steelblue", "salmon"]),
title="Sex",
),
column=alt.Column("age:O", title="Age"),
).properties(
width=20,
title="U.S. Population by Age and Sex"
).add_params(
select_year
).transform_calculate(
"sex", alt.expr.if_(alt.datum.sex == 1, "Male", "Female")
).transform_filter(
select_year
).configure_facet(
spacing=8
)
|
