Yan Holtz

Want to improve your #dataviz design eye?

➡️ I just released a little game:

You have to spot the better version of a chart and learn the fundamental concepts along the way.

www.matplotlib-journey.com/bonus/design...

What's your score!? 😀

Is the green group increasing or decreasing?

I really love this kind of examples, illustrating the weaknesses of a chart type 🙂

Looking for #dataviz inspiration?

My www.dataviz-inspiration.com project keeps growing! 🚀

Hundreds of stunning projects, filterable by chart types. A bit like Pinterest, but for dataviz🙃

What are your favorite projects? Your favorite creators?

I would love to add them!! 🙏

Love your portfolio! ❤️

You're going to love d3, but it's a bit hard at the beginning!

Do you want to work in a react environment?

2 websites I made that could help you:
- d3-graph-gallery.com
- react-graph-gallery.com

Anything that make you struggle, please let me know and I'll write a tuto :)

Never use a dual Y axis line chart!

I made a little playground:
You can tweak the axis limits and see how different the graph looks like:

www.react-graph-gallery.com/example/dual...

🚨 Stop chasing the p-value!

Increasing your sample size will always yield a significant result.
Even for trivial differences.

🎮 I created a little interactive playground to illustrate this issue:
react-graph-gallery.com/example/t-test-playground

Always pair p-values with effect sizes!

🎁 New tutorial on the R Graph Gallery!

A bump chart by @matschnetzer

The key to clarity in this #dataviz is highlighting a few key lines, preventing the chart from becoming too cluttered (aka spaghetti chart)

➡️ Full code and explanation:
r-graph-gallery.com/web-bump-plot-with-highlights.html

🚨 r2 can be very misleading!

I just made a little scatterplot where you can drag circles and instantly see the r2 & regression line:

www.react-graph-gallery.com/example/scatterplot-r2-playground

Perhaps it can help you get a better intuition of how r2 works!

Need a color palette for #dataviz?

➡️ Check my color palette finder!

🚀 2500 palettes available
👀 Instantly see how palette looks like on 7 charts
⌨️ R/Python code available
☑️ Test for color-blindness
🔎 Filter palettes easily

matplotlib-journey.com/module2/pypalettes

Thanks so much!

Recently a Nobel Laureate gave a talk with a very very bad scatterplot.

I can't find it again.. 😔

Any idea?? 🙏🙏🙏🙏🙏

Sneak peak of the interactive widgets of Matplotlib-journey.com! 🙂

Love this.
Lisa's blogposts about color keep amazing me! 😍

What background color should your data vis have? - Datawrapper Blog Let's look at 100 data visualizations from advanced data vis designers and beginners. Which background colors do they use – and why?

Never know what color to use for your graph background?

Check this article by @lisacmuth.bsky.social !

🌈 If in light mode, use a bright color (high luminance) and a low saturation. Stay in warm tones.

🌚 If in dark mode, use dark grays instead of pure black

blog.datawrapper.de/background-c...

👋 Hi, I’m Yan ☀️

I’m passionate about #dataviz!

I worked in academia & at a big tech company. Now, I create educational projects + freelance in the field.

More at yan-holtz.com ☺️

I’m new here! 🦋
So in the next few days I'll share some of the dataviz tools I’ve built, hoping they can help u!

👋 Hello world! ☀️