Suppose three different drugs are being considered for treating some disorder and that it is desired to check for side effects related to liver damage. Further suppose that the following data are...

Suppose three different drugs are being considered for treating some disorder and that it is desired to check for side effects related to liver damage. Further suppose that the following data are collected on 28 subjects:

The values under the columns headed ID indicate which of the three drugs a subject received. Store this data in an S-PLUS variable having matrix mode with 28 rows and two columns, with the first column containing the subjects’ ID number and the second column containing the resulting measure of liver damage. For example, the first subject received the first drug and liver damage was rated as 92. Use the function selby to put the data in the second column into an S-PLUS variable having list mode; then compare the groups using t1way.