There was the Hout report at Berkeley. Obviously, it is only relevant to Berkeley, not any other college.
However, the Berkeley holistic review process was designed for consistency and repeatability, and uses fewer factors (e.g. no recommendations), which is probably quite unlike the holistic review process at many other highly selective colleges, so it is probably easier to analyze than a process where repeating the process could result in an entirely different admission class.
With holistic admissions, here will be an impasse in arguments between:
a. Those who say that bias against Asian applicants cannot be proved without seeing all of the applications.
b. Those who say that the opaque holistic process easily hides and (conscious or unconscious) bias against Asian applicants.