Creating a Scatterplot of the Dependent by the Independent

  1. To produce a scatterplot of sales by advertising money spent, from the menus choose:

    Graphs > Chart Builder...

    Figure 1. Chart Builder
    Chart Builder
  2. Select the Scatter/Dot gallery and choose Simple Scatter.
  3. Select Detrended sales as the y variable and Advertising spending as the x variable.
  4. Click OK.

These selections produce the scatterplot.

Figure 2. Chart Editor
Chart Editor

The resulting scatterplot shows that sales increase with increased advertising; however, the sales return on advertising investment appears to decrease with increased spending, until increased advertising has no further effect on sales. An appropriate model for this kind of pattern is the asymptotic regression model.

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