1 From the Department of Radiology, Brigham and Women’s Hospital, Harvard Medical School, Boston, Mass (K.H.Z., J.R.F., S.G.S., C.M.C.T.); and Department of Health Care Policy, Harvard Medical School, 180 Longwood Ave, Boston, MA 02115 (K.H.Z.). Received September 10, 2001; revision requested November 8; revision received December 12; accepted December 19. Supported in part by Public Health Ser...

Many of the nominal-the-best quality characteristics important machine tool components, such as inner or outer diameters, have asymmetric tolerances. An tolerance index is a function for average process and standard deviation. Unfortunately, it difficult to obtain 100(1−α)% confidence interval index. Therefore, this study adopts Boole’s inequality DeMorgan’s theorem find combined region well Ne...