This function computes the MSE for both the random factorial (Model 2) and mixed factorial (Model 3) without subject-rater Interaction. This MSE is used for calculating confidence intervals and p-values associated with the inter-rater and intra-rater reliability coefficients.
mse2.nointer.fn(dfra)This is a data frame containing 3 columns or more. The first column contains subject numbers (there could be duplicates if a subject was assigned multiple ratings) and each of the remaining columns is associated with a particular rater and contains its numeric ratings.
Gwet, K.L. (2014): Handbook of Inter-Rater Reliability - 4th ed. chapter 10, section 10.3.1, Advanced Analytics, LLC.