Well, if you're establishing some percentages, then to me that makes some sense to me that you have a goal in mind and it needs to be stated. To be just looking at percentages, no, I think that's not an approach. I'm not saying that those who are using those percentages aren't looking at it that way. I certainly would not do that, just setting a certain percentage aside. Unless you can describe the objective, the goal you're trying to reach, and why that percentage has an impact—and that's typically scientific data—then no, you wouldn't do that.
On January 30th, 2018. See this statement in context.