The new DDFM=KENWARDROGER2 option applies the (prediction) standard error and degrees-of-freedom correction that are detailed by Kenward and Roger (2009). This correction further reduces the precision estimator bias for the fixed and random effects under nonlinear covariance structures.

The odds ratio, relative risk, and kappa plots now display the common (overall) statistic in addition to the statistics for each two-way table (stratum).