As promised we will collect some further material for those of you who want to deepen their knowledge of R.
Created by a psychologist who included his own lecture videos which are very helpful. Geared mostly towards statistical analysis but has a very good section on data cleaning and data manipulation, some web scraping and machine learning, NLP (Natural Language Processing) and API usage. This course is super usefull when you are starting your own project in R.
Here you can find an introduction to R course, and several courses that build on that. This is very usefully if you want to get more fluent at “speaking” R and want to practice with exercises.
YouTube will help you on the question what to do after your initial test month expired.
Sometimes, installing packages with the install.packages function does
not seem to work. In those cases you can try to:
The first thing to check is whether you spelled the function correctly. It’s a common mistake to forget the s at the end of packages or the quotation marks around the package “name”. install.packages(“name”), it’s a common mistake to forget the s or the quotation marks “”).
install.packages(“name”)
If this was not the problem, it could be that R struggles to find the specific “mirror” from which it is supposed to download the package. In that case, try specifiying the repository:
install.packages(“ggplot2”, repos=‘http://cran.r-project.org’)
#telling R to search the CRAN master site at TU Wien, Austria
Next, try changing the configuration in R Studio: Go To Tools -> Global option -> Packages. Then un-check the option “Use secure download method for HTTP”
Obvious one, but chances are high that someone out there encountered the same problem.
See next section.
Paste the following code into the console and run the commands. The
updateR() command performs the following: finding the latest R version,
downloading it, running the installer, deleting the installation file,
copy and updating old packages to the new R installation. More info can
be found here!
# Updating R within R Studio
install.packages(“installr”)
library(installr)
updateR()
## Watch for small pop up windows. There will be many questions and they don’t always pop to the front.