`...the authors have clearly tackled, over several years, a variety of problems and have brought to bear on them a wide range of statistical techniques...These techniques are presented in an eminently readable way and were clearly investigated in response to real problems arising from the data. The book would thus serve well as revision reading for students of statistics...may be another contribution from the field of educational research which proves to be of major importance to social science in general." -- The British Journal of Mathematical and Statistical Psychology, Vol 35, Part 2, November 1982 `This book does much to show the way, point out the pitfalls, and indicate the potential rewards to the user of meta