Assessment performance measures
This article shows how to discover mathematically if the minimized level has been reached. However, coefficients of dispersion above the minimized level can be consistent with good assessment administration.
De Vries, John James
"How to tell whether the coefficient of dispersion cannot be reduced any further,"
Assessment Journal: Vol. 2
, Article 3.
Available at: https://researchexchange.iaao.org/assessment_journal/vol2/iss4/3