Hi,    I am calculating the ICC in a three level model.  I'm using PROC GLIMMIX.  My covariance parameter estimates are below. I'm just wondering if anyone can help with what the estimate for RWRK_ID means?  I'm not sure what the E-6 signifies. Any help would be appreciated. Thanks!   Covariance Parameter Estimates   Cov Parm      Subject                            Estimate           Standard Error CHOL(1,1)      RWRK_ID                         1.054E-6           0.1094 CHOL(1,1)      WRK_ID(RWRK_ID)          1.3724              0.06645   ... View more