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KDnuggets Home » News » 2016 » Mar » Tutorials, Overviews » R Learning Path: From beginner to expert in R in 7 steps ( 16:n11 )

R Learning Path: From beginner to expert in R in 7 steps


 
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This learning path is mainly for novice R users that are just getting started but it will also cover some of the latest changes in the language that might appeal to more advanced R users.



5.3 Data Visualization

 

One of the main reasons R is  the favorite tool of data analysts and scientists is because of its data visualization capabilities. Tons of beautiful plots are created with R as shown by all the posts on FlowingData, such as this famous facebook visualization:

 
facebook-world-connections
 

If you want to get started with visualizations in R, take some time to study the ggplot2 package. One of the (if not the) most famous packages in R for creating graphs and plots. ggplot2 is makes intensive use of the grammar of graphics, and as a result is very intuitive in usage (you’re continuously building part of your graphs so it’s a bit like playing with lego).  There are tons of resources to get your started such as this interactive coding tutorial, a cheatsheet and  an upcoming book by Hadley Wickham.

 

Besides ggplot2 there are multiple other packages that allow you to create highly engaging graphics and that have good learning resources to get you up to speed. Some of our favourites are:

If you want to see more packages for visualizations see the CRAN task view. In case you run into issues plotting your data this post might help as well.

Next to the “traditional” graphs, R is able to handle and visualize spatial data as well. You can easily visualize spatial data and models on top of static maps from sources such as Google Maps and Open Street Maps with a package such as ggmap. Another great package is choroplethr developed by Ari Lamstein of Trulia or the tmap package. Take this tutorial on Introduction to visualising spatial data in R if you want to learn more.

5.4 The stats part

 

In case you are new to statistics, there are some very solid sources that explain the basic concepts while making use of R:

 

 

Note that these resources are aimed at beginners. If you want to go more advanced you can look at the multiple resources there are for machine learning with R. Books such as Mastering Machine Learning with R and Machine Learning with R explain the different concepts very well, and online resources like the Kaggle Machine Learning course help you practice the different concepts. Furthermore there are some very interesting blogs to kickstart your ML knowledge like Machine Learning Mastery or this post.

5.5 Reporting your results

 

One of the best way to share your models, visualizations, etc is through dynamic documents. R Markdown (based on knitr and pandoc) is a great tool for reporting your data analysis in a reproducible manner though html, word, pdf, ioslides, etc.  This 4 hour tutorial on Reporting with R Markdown explains the basics of R markdown. Once you are creating your own markdown documents, make sure this cheat sheet is on your desk.

 

Step 6: Become an R wizard and discovering exciting new stuff

 

R is a fast-evolving language. It’s adoption in academics and business is skyrocketing, and consequently the rate of new features and tools within R is rapidly increasing. These are some of the new technologies and packages that excite us the most:

 

 

Once you have some experience with R, a great way to level up your R skillset is the free book Advanced R by Hadley Wickham. In addition, you can start practicing your R skills by competing with fellow Data Science Enthusiasts on Kaggle, an online platform for data-mining and predictive modelling competitions. Here you have the opportunity to work on fun cases such as this titanic data set.

 

To end, you are now probably ready to start contributing to R yourself by writing your own packages. Enjoy!


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