This procedure performs TURF analysis (Total Unduplicated Reach and Frequency), which finds groups of response variables that have the highest coverage in a sample. In contrast to simple frequencies, it accounts for the overlap in responses to different items.

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

Note: For users with IBM SPSS Statistics version 19 or higher, the SPSSINC TURF extension is installed as part of IBM SPSS Statistics-Essentials 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