| Exploring Data in Two Dimensions |
Example
In this section you create a scatter plot of the wind_kts and min_pressure variables of the Hurricanes data set. The wind_kts variable is the wind speed in knots; the min_pressure variable is the minimum central pressure for each observation.
The min_pressure variable has a few missing values; those observations are not included in the scatter plot.
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Open the Hurricanes data set. |
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Select Graph  Scatter Plot from the main menu, as shown in Figure 6.6. |
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Figure 6.6: Selecting a Scatter Plot
A dialog box appears as in Figure 6.7.
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Select the variable wind_kts, and click Set Y. |
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Select the variable min_pressure, and click Set X. |
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Click OK. |
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Figure 6.7: The Scatter Plot Dialog Box
A scatter plot appears (Figure 6.8) showing the bivariate data. The plot shows a strong negative correlation (
) between wind speed and pressure. The plot also shows that most, although not all, wind speeds are rounded to the nearest 5 knots.
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Figure 6.8: A Scatter Plot
You can click on any observation marker to select the observation. You can click while holding down the CTRL key to select multiple observations. You can drag out a selection rectangle to select a group of observations.
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