I think that all of the statistics you want are included in the various ods output tables, specifically varianceinfo, testvarianceinfo, and parameter estimates. see: http://support.sas.com/documentation/cdl/en/statug/63347/HTML/default/viewer.htm#statug_mianalyze_sect027.htm ... View more

i believe the two statements above say that you have two randoms effects: a random intercept for each class and a random intercept for each student (who are nested in their respective classes) ... View more

Former models G-side random components, and latter models R-side. Read about conditional (G) and marginal (R) distributions to understand how these might tie to the inferences you are attempting to draw (not knowing your data or questions). ... View more