Homework #3 Solution

Using R :

Load the following CSV file to your R environment :

http://www.math.smith.edu/sasr/datasets/help.csv

Using the above file perform the following,

• Create a dataframe of: id, pcs1, mcs1, substance, and race group

• Calculate: Mean, Max, STD, Max, Min of mcs1

• Create a frequency  table of substance vs. racegroup

• Substitute the missing values of mcs1 by the overall average