The Three Factor Analysis

It is important that the first grade from Supplier 1 has the same nominal degree of polymerisation as the first grade from Supplier 2, and as the first grade from Supplier 3, etc. Thus, the first grades for all the suppliers have a certain common property which distinguishes them in some way from the second grades of all the suppliers, etc. 

There are now gts individuals, and each can be uniquely determined by specifying particular ues of g, t, and s. We thus have three factors suppliers, grades of polder and temperature of processing. The technique of the analysis of variance for three factors is given later. The degrees of freedom and the components of variance are reproduced in Table 11.2. 

Source of Variance Degrees of Freedom Components of Variance 

For the testing of the main effects, there are a mmiber of possibilities — (i) All three interactions are non-significant. Strikmg them out in the table of components of variance in Table 11.2, and pooling thw degrees of freedom wift the residual, we obtain Table 11,3, — 

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