Part 1
Homework 2
Work with the tox data.frame already created.
Compute summary statistics (using the function
summary) for the pcolumn (percentage killed) only.
Compute the standard deviation of percentage killed.
Print out the first line in the tox data where percentage
killed is above 50% (i.e., line 4) without specifying the
line by number (do not do tox[4,]), but using the
percentage column instead (the pcolumn) and logical
operators. (That is, even though the toxicity data would look
different, your commands would still print out the first line where the
percentage killed exceeded 50% for the first time.)
Hint: it is good to write your S-Plus commands into a file
(any Mac editor installed is fine) and then copy and paste
the commands to the S-Plus prompt and evaluate and copy
and paste the result into a file.
Turn in the S-Plus output (showing the commands used
also).
May 4, 2000 Gardar Johannesson Page 1