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  3. Linear Algebra for Data Science in R

Exercise

Standardizing Your Data

In the lecture, we saw that you can learn a lot about a dataset by creating the matrix \(A^TA\) from it. In this exercise, you'll do that with athletic data for players entering the National Football League college draft. The dataset combine is loaded for you.

Instructions

100 XP
  • Extract only the numerical elements of the data frame by taking only the 5th through 12th columns. Call this A (we cannot do math on the non-numerical components in columns 1 through 4).
  • Turn this data frame into a matrix by using the as.matrix() command.
  • Subtract the mean of each of the columns of the matrix.