METHOD AND APPARATUS FOR ESTIMATING NECESSARY LIFE DIFFERENCE OF SIGNIFICANT DIFFERENCE DETERMINATION IN ACCELERATED TEST

摘要

PROBLEM TO BE SOLVED: To provide a method for determining the presence of significant difference from the life between two lots obtained in an accelerated test and calculating life difference due to magnification.;SOLUTION: The random numbers corresponding to the test number of a lot of a level 1 are produced from a certain Weibull distribution, the random number corresponding to the test number of a lot of a level 2 are produced from the same Weibull distribution and the life calculated from the produced random numbers is operated to calculate one set of a life ratio. This processing is repeated the set number of times to calculate the life ration of the number of sets of the set number of times to form the probability distribution and cumulated probability distribution of this life ratio. The maximum and minimum life ratios in set reliable width are read to determine the presence of significant difference. When the presence of the significant difference is determined, the Weibull distribution is changed to a different Weibull distribution to repeat the analyzing step of the cumulated probability distribution. A graph showing the relationship between the set magnification obtained by the repetition of the analyzing step and the maximum life in the reliable width is created and the value of the set magnification corresponding to the life ratio of the lives of the levels 1 and 2 in input data is read to be set as the life difference capable of determining at least the read value.;COPYRIGHT: (C)2008,JPO&INPIT