A wealth of new astronomical techniques and space missions may provide this evidence early in the next century."--BOOK JACKET.

Most reports of UFOs are cases of error or merely hoaxes. However a certain percentage defy all rational explanation. This study examines a number of cases that have been well documented and corroborated, yet remain unexplained.

A former field investigator for the Condon Project, the University of Colorado's scientific study of UFOs, relates details of individual cases of reported UFO sightings and offers a historical overview of the UFO phenomenon.

This work is essentially an extensive revision of my Ph.D. dissertation, [1J. It 1S primarily a research document on the application of probability theory to the parameter estimation problem. The people who will be interested in this material are physicists, economists, and engineers who have to deal with data on a daily basis; consequently, we have included a great deal of introductory and tutorial material. Any person with the equivalent of the mathematics background required for the graduate level study of physics should be able to follow the material contained in this book, though not without eIfort. From the time the dissertation was written until now (approximately one year) our understanding of the parameter estimation problem has changed extensively. We have tried to incorporate what we have learned into this book. I am indebted to a number of people who have aided me in preparing this docu ment: Dr. C. Ray Smith, Steve Finney, Juana Sunchez, Matthew Self, and Dr. Pat Gibbons who acted as readers and editors. In addition, I must extend my deepest thanks to Dr. Joseph Ackerman for his support during the time this manuscript was being prepared.