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Exercise

Coercing character columns into factors

As you saw in the last chapter, one of the features of readr import functions is that they don't automatically convert strings into factors like read.csv() does. Sometimes, though, you want one or more columns of data to be interpreted as factors.

In these situations, you can use parse_factor() after importing your data. You need to supply the column to be parsed and a vector of possible values as arguments to your call. In this case, you'll be parsing the title and gender columns of a data frame salaries (available in your workspace).

Instructions

100 XP
  • Use parse_factor() to convert the title column of salaries to a factor. Supply c("Prof", "AsstProf", "AssocProf") as the levels argument. Assign the result of the function call back to salaries$title.
  • Use the same function to parse the gender column of salaries. Supply c("Male", "Female") as the levels argument. Assign the result to salaries$gender.