It's a friendly metaphor, not real coffee. Each "coffee" is €3 and you can buy as many you like.
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About Gavin Simpson
Developing R packages, writing blog posts
Hi! I'm a statistical ecologist and I talk a lot about GAMs. I blog about them too from time to time, and even write R code to fit and work with those models. If you like what I do, you can now buy me a coffee.