On the efficacy of the rank transformation in stepwise logistic and discriminant analysis

Workers exposed to harmful dusts such as coal often are screened for possible pneumoconiosis. A classification devised by the International Labor Office (ILO) is used for film interpretation. Film interpretation is time consuming and requires the comparison of the subject's radiograph with as many as 22 standard films and the completion of a nonintuitive form. A computer program has been written to aid in interpretation of films. This program, written in SuperCard, uses hypermedia concepts to link textual, diagrammatic, and digital images. The program includes digitized ILO radiographs, guidelines, references, and other textual and radiographic material. The program is easy to use and reduces the time required to interpret films. The concepts of how the program is constructed are emphasized so that others may devise similar program aids.