data sitka88; set sitka; if year=89 then delete; run; proc mixed data = sitka88 method=ml itdetails; class days ozone tree; model logsize = days|ozone; repeated / type = un sub = tree; run; proc mixed data = sitka88 method = reml itdetails; class days ozone tree; model logsize = days|ozone; repeated / type = un sub = tree; run; OUTPUT The MIXED Procedure Class Level Information Class Levels Values DAYS 5 152 174 201 227 258 OZONE 2 0 1 TREE 79 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 ML Estimation Iteration History COVP1 COVP2 COVP3 COVP4 COVP5 1.00000000 0.00000000 1.00000000 0.00000000 0.00000000 0.42485560 0.38580634 0.37844332 0.35645065 0.35575980 ML Estimation Iteration History COVP6 COVP7 COVP8 COVP9 COVP10 1.00000000 0.00000000 0.00000000 0.00000000 1.00000000 0.35407035 0.35491593 0.35901180 0.35744727 0.38726316 ML Estimation Iteration History COVP11 COVP12 COVP13 COVP14 COVP15 0.00000000 0.00000000 0.00000000 0.00000000 1.00000000 0.35546713 0.35990314 0.35665399 0.38671289 0.39583520 ML Estimation Iteration History Iteration Evaluations Objective Criterion 0 1 21.12897573 1 1 -927.6455682 0.00000000 Convergence criteria met. Covariance Parameter Estimates (MLE) Cov Parm Subject Estimate UN(1,1) TREE 0.42485560 UN(2,1) TREE 0.38580634 UN(2,2) TREE 0.37844332 UN(3,1) TREE 0.35645065 UN(3,2) TREE 0.35575980 UN(3,3) TREE 0.35407035 UN(4,1) TREE 0.35491593 UN(4,2) TREE 0.35901180 UN(4,3) TREE 0.35744727 UN(4,4) TREE 0.38726316 UN(5,1) TREE 0.35546713 UN(5,2) TREE 0.35990314 UN(5,3) TREE 0.35665399 UN(5,4) TREE 0.38671289 UN(5,5) TREE 0.39583520 Model Fitting Information for LOGSIZE Description Value Observations 395.0000 Log Likelihood 100.8421 Akaike's Information Criterion 85.8421 Schwarz's Bayesian Criterion 56.0004 -2 Log Likelihood -201.684 Null Model LRT Chi-Square 948.7745 Null Model LRT DF 14.0000 Null Model LRT P-Value 0.0000 Tests of Fixed Effects Source NDF DDF Type III F Pr > F DAYS 4 77 316.71 0.0001 OZONE 1 77 2.07 0.1542 DAYS*OZONE 4 77 4.28 0.0035