Because B and its interactions appear to be insignificant, B may be dropped from the model. Dropping B results in a full factorial 2"3" design for the factors A, C, and D. Performing the anova using factors A, C, and D, and the interaction terms A:C and A:D, gives the results shown in the table, which are very similar to the results for the full factorial experiment experiment, but have the advantage of requiring only a half-fraction 8 runs rather than 16.