Interacting with Plots

Example

In this example, you insert text that displays certain statistics related to a scatter plot of two variables.

Open the Hurricanes data set, and create a scatter plot of wind_kts versus min_pressure.

The scatter plot (Figure 8.4) shows a strong negative correlation between wind speed and pressure. A correlation analysis reveals the following:

• There are 6185 observations for which both variables are nonmissing.
• The correlation between these two variables is approximately - 0.93.

You can display these statistics on the plot.

Right-click in the plot, and select Insert Annotation from the pop-up menu.

Figure 8.3: Creating an Annotation

The mouse pointer changes its shape. It looks like a pencil with the letter "A" next to it.

Drag out a rectangle with the mouse pointer, as shown in Figure 8.4.

Figure 8.4: Inserting an Annotation

Type text into the text box, as shown in Figure 8.5. Click outside the text box to finish editing the text.

You can resize or move the text rectangle after it is created, if necessary. You can also right-click on the text box to change properties of the text or the text box. For example, in Figure 8.5 the text box is displayed with a border around it. The annotation properties are discussed in the section "Annotation Properties".

Figure 8.5: An Inset Containing Statistics

If you decide to delete the annotation, click on the text box to select it. Then right-click outside the text box, and select Delete Annotation from the pop-up menu, as shown in Figure 8.6.

Caution: If you right-click inside the text box, you get a different menu, as discussed in the following section.

Figure 8.6: Deleting an Annotation