Mo. Rev. Stat. § 379.890: Rates, rate plan or rate system filing, when — required actuarial data.

Supporting actuarial data shall be filed in support of a commercial casualty insurance rate, rating plan, or rating system filing, whenever requested by the director to determine whether rates are excessive, inadequate or unfairly discriminatory. The data shall be in sufficient detail to:

(1) Justify any rate level changes; and

(2) Demonstrate the statistical significance of differences or correlations relevant to rating plan definitions and rate differentials.