Using Mahalanobis-Taguchi system, diagnosis procedure combination survey data from 2007 to 2009 was analyzed. The object was 80 medical university hospitals of the whole country. Unit space was made using the data of the examination item at 7 consecutive higher medical university hospitals for three years. Distance (D) was calculated by RT method. Multi RT method was used, and compression of pattern D was carried out about a 3-year change and general D was demanded. And an order change account was carried out in general D. This order serves as a reference for an index of the collective strength of each medical university hospital.
