The authors would like to thank all the technical reviewers, including Paul Grant, Elizabeth Axelrod, Michele Ensor, and Grace Whiteis, who provided invaluable feedback. They are also grateful to the SAS Press staff. Both groups helped make this book a reality.

We would also like to thank the R&D team at SAS for implementing the powerful facilities of the SAS hash object.

Special thanks to the customers whose challenging business intelligence requirements led us to research how to address those requirements. Results of that research led us to write this book in order to share that knowledge. Special thanks to Rich N and Paulius M of a large health insurance company and to Tom H of a regional supermarket co-op’s marketing department. ...

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