Improving Correlation Estimates

  1. To remove the Metro from the correlation computations, from the menus choose:

    Data > Select Cases...

    Figure 1. Select Cases dialog box
    The Select Cases main dialog box. Cases are to be selected based upon the satisfaction of a condition, to be determined.
  2. Select If condition is satisfied and click If.
    Figure 2. Select Cases If dialog box
    The Select Cases If dialog box. Cases that are not the Metro will be selected.
  3. Type model ~= 'Metro' in the text box.
  4. Click Continue.
  5. Click OK in the Select Cases dialog box.

    A new variable has been created that uses all cases except for the Metro in further computations.

    Figure 3. Bivariate Correlations dialog box
    The Bivariate Correlations main dialog box. Fuel efficiency and Log-transformed sales are selected for analysis.
  6. To analyze the filtered data, recall the Bivariate Correlations dialog box.
  7. Deselect Sales in thousands as an analysis variable.
  8. Select Log-transformed sales as an analysis variable.
  9. Click OK.

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