There are several possibilities to create a presentation in R. Last versions of RStudio allow us to do it very easily and using a simple syntax with markdown. The result is so clean and elegant, and we can forget to export plots or dataframes to insert in a presentation because RMarkdown does it for us. Yesterday I presented this in a meetup of R Users in Madrid and I encourage you to take a look! I hope it is usefull!
See the link below:
PD: This presentation was made with revealjs library, simple theme and convex transitions.