Assignment 3

Please complete before the next class. Make sure that you’ve completed all previous HW first.

FPP

Read chs. 1 and 2 of FPP (the textbook; I sent a pdf via email) and do the assigned review exercises here.

Notes:

  1. You only need to do the review exercises for chs. 1 and 2—not every single chapter. We’ll get to the rest over the course of the semester. And yes, there is a reason I include this note.
  2. If you want to print this PDF for convenience, that’s a great idea. It’s unlikely to change during the semester.

R

Read and review your notes, my notes, and my slides over the basics of loading data into R. Answer the review questions throughout the document. Remember to practice!

Debugging

When you can’t get your code to work, it’s usually just a missing parenthesis or quotation mark. It’s not that you’re making a huge mistake. Huamns can sitll mkae snese wehn tehre are tpyos, but not computers! Check your code for typos carefully. Run your script one line at a time, from top to bottom, to find mistakes. As examples, most mistakes are like the following:

b <- c("Male", "Female)  # missing the second " after "Female"
exp(23  # forgot to close a parentheses
log(10 base = 2)  # missing comma between arguments

a <- c(1, 2, 3)
mean(A)  # R is case-sensitive--there's an object "a", but no object "A" 
mena(a)  # misspelled function name
Mean(a)  # R is case-senstive
mean(a   # missing parentheses
mean("a")# using quotes when you shouldn't (or vice versa)