Patent ID: 7321836

Claim:
A method for qualifying a first product based on an equivalency index associated with a characteristic parameter of the product, comprising: a. identifying at least one variable characteristic parameter of the first product; b. measuring said parameter on a group of the first product; c. recording the data of the measurement; d. constructing a first probability distribution from the data; e. repeat step b and c on a group of a second product, the second product being possessive of known desirable quality; f. deriving an average value and a standard deviation from the data taken from the second product; g. performing an integration of the first probability distribution over limits related to the average value and standard deviation; h. deriving an equivalency index of said variable characteristic parameter based on the result of the integration; i. setting a threshold value for the equivalency index; j. comparing the equivalency index to the set threshold value; k. declaring the first product as being of equivalent quality as the second product when the equivalency index of at least one identified characteristic parameter is not lower than the set threshold value.