Considering the impact that could be considered by joint use of horizontal variance calculation. The example 6.1, or consider using the calculation of the difference in the vertical (Vertical), it can be done, and you will see that in the case of two factors, factors affecting the response (Y) value will change for one factor, depending on the experimental conditions, at the level of the rest of the factors, that is, the response value Y.When changing the value of B from the 1st to the 2nd case (b) is changed to 5 or 0, it is up to those who try to experiment with the level 1 or the level 2 of A joint, so consider the impact it might have considered using a graph called a "Plot Interactions" (the graph effect) If the line graph in parallel (parallel) shows that the difference between the fixed values are equal, or if not found, it means the affected joint (No interactions) among the factors.