(Slide 1)

Lecture 4: Displaying & Describing Data

Chapters 2 & 3, Whitlock and Schulter, 2nd Ed

Key questions:

What makes a good graph?

What makes a bad graph?

Types of graphs for types of different data

Describing “central tendency”: mean & median

Describing variation: variance & stdev

(Slide 2)

Basics Rules of plotting data

1) Show the raw data if possible

2) Show distributional info if possible

3) ALWAYS Include error bars around means

4) ALWAYS Include error bars around means

5) Make patterns in the data easy to see

6) Represent magnitude honestly

7) Draw graphical elements clearly

8) Include a legend and label things clearly

(Slide 3.5)

Plotting Rule #1: Show the raw data