5.6. Case Studies
5.6.2. Sonoluminescent Light Intensity Case Study
Block plots are a
useful adjunct to the DOE mean plot and the DOE interaction effects
plot to confirm the importance of factors, to establish the
robustness of main effect conclusions, and to determine the
existence of interactions.
For block plots, it is the height of the bars that is important, not the relative positioning of each bar. Hence we focus on the size and internal signs of the blocks, not "where" the blocks are relative to each other.
We note in passing that for a fractional factorial design, we cannot display all combinations of the six remaining factors. We have arbitrarily chosen two robustness factors, which yields four blocks for comparison.
|Conclusions from the Block Plots||
We can make the following conclusions from the block plots.