You can access datasets from the R datasets package by using
data(NAME_OF_DATASET)
For this question, we will use the dimaonds data from the ggplot2 library.
library(tidyverse) # Note the tidyverse package loads the ggplot2 library data(diamonds)
Note you can learn about this dataset by using
help(diamonds)
a. Determine the (i) mode and (ii) class of the diamonds data object.
b. How would you find how many rows and columns the object has by using R functions nrow and ncol ? Give the code and the result.
c. What is the value contained in row 12345 and the depth column (which contains the depth percentage)?
d. Write a line of code that creates a new data object called diamonds_imp which is of the same mode and class as the original diamonds data object and contains the same columns as the original, but also contains three new columns: x_imp , y_imp , z_imp where each of these measurements are Imperial measurements in inches, i.e. x_imp is equal to x divided by 25.4, as there are 25.4 mm in 1 inch. Show the first 6 rows of the resulting data object.
e. Write a line of code that adds a column named over_under to the diamonds_imp data object that contains the difference between the price of the diamond in that row and the median of the prices of other diamonds with the same color .
f. Write a line of code that creates a new data object from the original diamonds data object named Expensive that contains only the diamonds whose price is strictly greater than $18800 and show the
contents of that data object.
