Confidence Intervals

This example uses the data file survey_sample.sav. See the topic Sample Files for more information.

Confidence intervals and standard errors are available for many table statistics.

  1. From the menus, choose:

    Analyze > Tables > Custom Tables...

  2. In the table builder, move Highest degree to the row area of the canvas pane.
  3. Click Summary Statistics...
  4. In the Statistics list in the Summary Statistics dialog, click the icon next to Count to expand the list of count-related statistics.
  5. Move the following statistics to the Display area: Column N%, Lower CL for Column Count %, Upper CL for Column Count %, and Standard Error of Column Count%.
  6. In the Confidence Intervals group, for Level (%), enter 99.
  7. Click Apply to Selection, and then click Close.
  8. Click OK to create the table.
    Figure 1. Table of counts, column percentages, and confidence intervals
    Table of counts, column percentages, and confidence intervals
  9. Recall the Custom Tables dialog and click Summary Statistics...
  10. For the lower confidence limit, change the label to "Lower Confidence Limit (&[Confidence Level])". The string "&[Confidence Level]" inserts the value of the specified confidence level at that location in the label.
  11. Click Apply to Selection, and then click Close.
  12. Click OK to create the table.
    Figure 2. Table with modified confidence interval label
    Table with modified confidence interval label