This procedure produces binomial and Poisson confidence intervals for proportions. The binomial interval is based on the Jeffreys formula also used in error bar charts.

• IBM SPSS Statistics 18 or later and the corresponding IBM SPSS Statistics-Integration Plug-in for Python.

1. Open IBM SPSS Statistics
2. Navigate to Utilities -> Extension Bundles -> Download and Install Extension Bundles
3. Search for the name of the extension and click Ok. Your extension will be available.

• Apache 2.0

• JKP, IBM SPSS