The wording in the original article isn't entirely clear to me. If the test is across different "states" of one factor, then the number of required datapoints s

The wording in the original article isn't entirely clear to me. If the test is across different "states" of one factor, then the number of required datapoints should be approximately f*n. So for example, testing four different button placements is like testing four different treatments: button placement 1 button placement 2 button placement 3 button placement 4 However, if multiple states also coincide with testing multiple factors, such as four different button placements and also three variations of text on the buttons. Then the number of combinations is 12. In this case, if we add another text variation, we would be adding four more treatments.