Using Bootstrapping to Obtain Confidence Intervals for Proportions

A telecommunications firm loses about 27% of its customers to churn each month. In order to properly focus churn reduction efforts, management wants to know if this percentage varies across predefined customer groups.

This information is collected in telco.sav. See the topic Sample Files for more information. Use bootstrapping to determine whether a single rate of churn adequately describes the four major customer types.

Note: This example uses the Frequencies procedure and requires the Statistics Base option.

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