Longitudinal Data and Sas: A Programmer's Guide

Working with longitudinal data introduces a unique set of challenges. Once you've mastered the art of performing calculations within a single observation of a data set, you're faced with the task of performing calculations or making comparisons between observations. It's easy to look backward in data sets, but how do you look forward and across observations? Ron Cody provides straightforward answers to these and other questions. Longitudinal Data and SAS details useful techniques for conducting operations between observations in a SAS data set. For quick reference, the book is conveniently organized to cover tools-an introduction to powerful SAS programming techniques for longitudinal data; case studies-a variety of illuminating examples that use Ron's techniques; and macros-detailed descriptions of helpful longitudinal data macros. Beginning to intermediate SAS users will appreciate this book's informative, easy-to-comprehend style. And users who frequently process longitudinal data will learn to make the most of their analyses by following Ron's methodologies.

By day, Ron Cody, Ed.D. is a professor and researcher at the Robert Wood Johnson Medical School. With more than 20 years of experience using, teaching, and writing about SAS, he has undeniably earned his "SAS expert" title.

Ron applies his expertise in this latest addition to his impressive list of works, including The SAS Workbook The SAS Workbook Solutions Cody's Data Cleaning Techniques Using SAS Software as well as his coauthored books SAS Programming by Example Applied Statistics and the SAS Programming Language, Fourth Edition.