Linear Discriminant Analysis

SDA is really a screening operation. The investigator wants to find out which measurements are useful to resolve product differences. Then either the discriminant or the classification coefficients are utilized to form a discriminant function. The form of the equation is

where the a's are weighting values, the Xs are the measurement values, C is a correction factor, and Z is the weighted mean. The magnitude of the weighted mean determines the class to which the sample is assigned. The correction term is provided (it is a part of the computer output) to enable original (raw) measurement values to be used. As a part of the DA calculation, the measurement

Table 4. Ward's Minimum Variance Cluster Analysis Applied to Five Grades of Tea, Grade Five Being a High-Quality Tea, Grade One Being the Tea Lowest in Quality

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