Code review

[pschloss]

Nice work! A few comments...

1. Your code chunk had some output that seems pretty stray/random in the html file. You might make sure the statements that are generating this output are outputting to a variable that is used later or are removed.
2. It would have been good to see more interpretation of your results than just a presentation of the figure. Also, you should play around with presenting summary statistics using the inline code.