Method and apparatus for detecting abnormal characteristic values capable of suppressing detection of normal characteristic values

摘要

In a method for detecting abnormal characteristic values of a plurality of products sequentially manufactured in the same manufacturing line, it is determined whether or not a successive-decrease (or increase) tendency has occurred in a plurality of sequentially-obtained characteristic values of the products. Also, it is determined whether or not at least a last one of the characteristic values is located within a control region narrower than an allowable region and outside a normal region narrower than the control region. Further, when the successive-decrease or increase tendency has occurred and the last characteristic value is located within the control region outside the normal region, an alarm state is detected.