Density chart

Density plots allow to visualize the distribution of a numeric variable for one or several groups. They are very well adapted for large dataset, as stated in data-to-viz.com. Note that 2 approaches exist to build them in python: the first one consists in computing a kernel density estimate, the second one in building a high resolution histogram.

⏱ Quick start

If you are in a rush, the most straightforward way to build a density chart is to use `Seaborn` and its `kdeplot()` function. You just need to provide it with a numeric variable from your dataset. 🔥

``````# library & dataset
import seaborn as sns

# Make default density plot
sns.kdeplot(df['sepal_width'])
``````

Density charts with `Seaborn`

`Seaborn` is a python library allowing to make better charts easily. It is well adapted to build density charts thanks to its `kdeplot` function. The following charts will guide you through its usage, going from a very basic density plot to something much more customized.

Density charts, `Seaborn` and multiple groups

It is a common use case to compare the density of several groups in a dataset. Several options exist to do so. You can plot all items on the same chart, using transparency and annotation to make the comparison possible. Or you can a technique called small multiples where the graph window is split in individual charts, avoiding group overlaps that are sometimes hard to read.

A density chart with multiple groups displayed, transparency and clean annotation.

🔎 `kdeplot` function parameters→ see full doc

`string`color under the curve

Density charts with `Matplotlib`

It is possible to build a density chart with `matplotlib`, but it is truely a struggle compared to making it with `seaborn` as shown above. Here is an example to prove it is doable, but I strongly advise to go for `seaborn`.

Contact

👋 This document is a work by Yan Holtz. Any feedback is highly encouraged. You can fill an issue on Github, drop me a message onTwitter, or send an email pasting `yan.holtz.data` with `gmail.com`.

Violin

Density

Histogram

Boxplot

Ridgeline

Scatterplot

Heatmap

Correlogram

Bubble

Connected Scatter

2D Density

Barplot

Wordcloud

Parallel

Lollipop

Circular Barplot

Treemap

Venn Diagram

Donut

Pie Chart

Dendrogram

Circular Packing

Line chart

Area chart

Stacked Area

Streamgraph

Timeseries

Map

Choropleth

Hexbin

Cartogram

Connection

Bubble

Chord Diagram

Network

Sankey

Arc Diagram

Edge Bundling

Colors

Interactivity

Animation

Cheat sheets

Caveats

3D