Thanks for your additional data Bill. I'll add it.
My source is clearly cited for the YP curves- it's from Ball State. And the discussion points out concern. I'll attempt to reach authors.
The beginning of my graduate research was a good literature study. All advanced research should benefit from prior work and sift what is valuable. As you say, we need not be in a hurry and I believe that includes not hurrying to dismiss unexplained data. We may learn valuable things.
