Today:

1. Scatterplot AKA bivariate plot
2. Linegraph
3. Boxplot
4. Barplot AKA Barchart AKA bargraph
5. Histogram

If I know your name, I can guess your age.

• All the plots with either blue/yellow bars red dots are boxplots (without whiskers) that indicate the 3 quartiles
  • 1st quartile i.e. 25th percentile
  • 2nd quartile i.e. 50th percentile
  • 3rd quartile i.e. 75th percentile

• The 2nd quartile is also called the median. It is a measure of center
• The width of the bars (3rd quartile - 1st quartile) is the interquartile range (IQR)
• The IQR contains the middle 50% of observations. It is a measure of spread

Breakdown of components.

You can compare distributions of values in different groups with a single line.

Look at the chart in this Planet Money article. In this case, you can compare cities with a single vertical line.

Before we lay out boxplots however, we have two digressions:

• Facets: spliting a plot on a categorical variable
• Summary statistics