* Model on Page 91. MIXED future WITH contrib culture /FIXED = contrib culture contrib*culture /PRINT = SOLUTION TESTCOV /RANDOM INTERCEPT | SUBJECT(dyad). * Model on Page 91-92 to Allow for Negative Nonidependence. MIXED future WITH contrib culture /FIXED = contrib culture contrib*culture /PRINT = SOLUTION TESTCOV /REPEATED = sex | SUBJECT(dyad) COVTYPE(CS) . * Empty Model on Page 94 to Estimate the Intraclass Correlation. MIXED future /FIXED = /PRINT = SOLUTION TESTCOV /REPEATED = sex | SUBJECT(dyad) COVTYPE(CS) . *Model to allow for hetereogenous variances. MIXED future WITH contrib culture /FIXED = contrib culture contrib*culture /METHOD = REML /PRINT = SOLUTION TESTCOV /REPEATED = sex | SUBJECT(dyad) COVTYPE(CSH) . * The "Two Intercept" Model. MIXED future BY sex WITH culture contrib /FIXED = culture contrib contrib*culture sex | NOINT /PRINT = SOLUTION TESTCOV /RANDOM INTERCEPT | SUBJECT(dyad) .