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Exercise

Data Frames, Ranks and Orders

This exercise is somewhat more challenging. We are going to repeat the previous exercise but this time order my_df so that the states are ordered from least populous to most.

Instructions

100 XP
  • Create variables states and ranks to store the state names and ranks by population size respectively.
  • Create an object ind that stores the indexes needed to order the population values, using the order command. For example we could define o <- order(murders$population)
  • Create a data frame with both variables following the correct order. Use the bracket operator [ to re-order each column in the data frame. For example, states[o] orders the abbreviations based by population size.
  • The columns of the data frame must be in the specific order and have the specific names: states, ranks.