Patent ID: 7424336

Claim:
A test data analyzing system for estimating a fabrication machine that makes a defect cause in a product that is fabricated through plural processes, including two or more repetitions, the system comprising: a fabrication line data management unit, which records information of machine code numbers specifying fabrication machines that process the product in a time series, as fabrication line data for the respective products; a test data management unit, which stores test data obtained from an inspection done on the product by an inspection machine; and a data analysis unit, which (1) presents a user interface that displays the list of the products and the test data to a user, accents the input of the selection of the product and the inspection items by the user, (2) reads a fabrication line data of each of the selected products, groups the products per each machine code number per usage frequency of the fabrication machine, (3) reads the test data of the selected inspection item corresponding to each product to prepare a test data distribution for each group, (4) calculates a significance probability P value from the ratio between each variance of the test data distribution per usage frequency of the fabrication machine by machine code numbers, (5) displays a box-and-whisker plot of the usage frequency of the fabrication machine and the test data, on a basis of an order sorted by the significance probability P value as designated by a user.