Statistical methods in longitudinal research. Alexander von Eye (Ed), Academic Press, Boston, 1990. VOL. 1: Principles and structuring change. No. of pages: xiv + 256. Price: $34.95, ISBN: 0‐12‐724962‐1 VOL. 2: Time series and categorical longitudinal data. NO. of pages: xiv + 312. Price: $34.95, ISBN: 0‐12‐724963‐X