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Yan Holtz

@yan-holtz.bsky.social

653 followers 149 following 16 posts

I ❤️ dataviz! Author of - data-to-viz.com - the R, Python, d3 and React graph galleries - dataviz-inspiration.com

Posts Replies Media

Yan Holtz @yan-holtz.bsky.social · 16/06/2025

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!? 😀

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Yan Holtz @yan-holtz.bsky.social · 10/02/2025

Is the green group increasing or decreasing? I really love this kind of examples, illustrating the weaknesses of a chart type 🙂

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Yan Holtz @yan-holtz.bsky.social · 29/01/2025

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!! 🙏

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Yan Holtz @yan-holtz.bsky.social · 27/01/2025

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...

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Yan Holtz @yan-holtz.bsky.social · 16/01/2025

🚨 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!

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Yan Holtz @yan-holtz.bsky.social · 15/01/2025

🎁 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

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Yan Holtz @yan-holtz.bsky.social · 09/01/2025

🚨 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!

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Yan Holtz @yan-holtz.bsky.social · 06/01/2025

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

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Yan Holtz @yan-holtz.bsky.social · 21/12/2024

Recently a Nobel Laureate gave a talk with a very very bad scatterplot. I can't find it again.. 😔 Any idea?? 🙏🙏🙏🙏🙏

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Yan Holtz @yan-holtz.bsky.social · 17/12/2024

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

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Yan Holtz @yan-holtz.bsky.social · 16/12/2024

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...

blog.datawrapper.de

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?

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Yan Holtz @yan-holtz.bsky.social · 09/12/2024

👋 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!

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Yan Holtz @yan-holtz.bsky.social · 05/12/2024

👋 Hello world! ☀️

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