Blocking Factor with Varying Distributions
I am a heavy user of DOE with up to 8-factors and one blocking variable. Each block is subjected to a condition over time. The problem is the S/N ratio improves over that time. Assume the distribution is normal and just the width decreases over time. Another key is the time at which each block is removed from the test is unknown prior to the test and is uncontrolled. And each block can be rem...