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Update reference to ggplot2 book (#1007)

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Jakob Krigovsky 2022-04-13 16:19:26 +02:00 committed by GitHub
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@ -683,9 +683,8 @@ The chunk label is used to generate the file name of the graphic on disk, so nam
## Learning more
The absolute best place to learn more is the ggplot2 book: [*ggplot2: Elegant graphics for data analysis*](https://amzn.com/331924275X).
The absolute best place to learn more is the ggplot2 book: [*ggplot2: elegant graphics for data analysis*](https://ggplot2-book.org).
It goes into much more depth about the underlying theory, and has many more examples of how to combine the individual pieces to solve practical problems.
Unfortunately, the book is not available online for free, although you can find the source code at <https://github.com/hadley/ggplot2-book>.
Another great resource is the ggplot2 extensions gallery <https://exts.ggplot2.tidyverse.org/gallery/>.
This site lists many of the packages that extend ggplot2 with new geoms and scales.