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"""
Faceted Density Estimates
-------------------------
Density estimates of measurements for each iris flower feature
"""
# category: distributions
import altair as alt
from vega_datasets import data
source = data.iris()
alt.Chart(source).transform_fold(
['petalWidth',
'petalLength',
'sepalWidth',
'sepalLength'],
as_ = ['Measurement_type', 'value']
).transform_density(
density='value',
bandwidth=0.3,
groupby=['Measurement_type'],
extent= [0, 8]
).mark_area().encode(
alt.X('value:Q'),
alt.Y('density:Q'),
alt.Row('Measurement_type:N')
).properties(width=300, height=50)
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