How to refer to a variable name with spaces?

Question

In ggplot2, how do I refer to a variable name with spaces?

Why do qplot() and ggplot() break when used on variable names with

Answer 1

Using get is not more "formal", actually I would argue the opposite. As the R help says (help("`")), you can almost always use a variable name that contains spaces, provided it's quoted. (Normally, with a backtick, as already suggested.)