Write series of short exercises to develop R programming skills

For this project you will develop 10 short exercises related to an object (e.g., a data frame) or function (e.g., the merge() function) that is part of base R. You do not need to explain the concept or function (as in a tutorial), just the exercise. Exercises could focus on a particular aspect of an object or function argument. However, they may also be designed to test or train knowledge about the object/function in general. You may distinguish between easier and harder exercises, and make use of the built-in datasets of R, or create some fake data with a few lines of R code. In addition to the exercises, you will provide a working R script with all solutions. The materials you provide may be used for e-learning, blogs, e-books, tutorials etc. We will provide you with a list of objects and functions (all part of base-R), from which you can pick one as the focus of the exercises. Depending on the quality and creativity of the exercises you developed, we may extend our collaboration to more objects and functions. Obviously you need a very good understanding of the R language. When bidding on this project, please indicate your experience with R. You may include an example exercise if you wish.