In this chapter, we firstly talked very briefly about what R is. We did not cover where to get it and how to install it as we are assuming the reader will have some preliminary knowledge in those areas. Then we introduced what R objects are and their modes and classes. We also highlighted how we can convert modes of objects using R functions such as
as.character. Finally, we discussed different R objects, such as vector, factor, data frame, matrix, and list. The chapter ended with an introduction to how missing values are represented and dealt with in R. In the next chapter, we will discuss data manipulation with different R objects in greater detail.