Backward Elimination Predictors Removed from the Model

Backward Elimination Predictors Removed from the Model 

Let us use the data from Example 4.2 again, and the six-step procedure, to evaluate the variables via the backward elimination procedure, beginning with X] and working toward x.  

Step 5 Perform the computation (Table 4.21). The full model is presented in Table 4.21, and the reduced in Table 4.22. 

Because F = 3.22 =532 = Ft , one cannot reject Hq at a = 0.05. Therefore, drop Xi from the model, because its contribution to the model is not significant. The new full model is 

Because Fc=l.40 / Ft = 5.12, one cannot reject //q at a = 0.05. Thus, omit (logic colony counts) from the model. Now observe what has happened. 

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