Hi, I'm trying to run a proc mixed covtest, and keep recieving errors.   First, I tried running:   proc mixed covtest data=rsa1; where ans_ctas=1; class couple_id women session; model UFBs_total= male male*x male*y male*x_x male*x_y male*y_y male*lUFBs_totalmc female female*x female*y female*x_x female*x_y female*y_y female*lUFBs_totalmc /s ddfm=satterth noint; random /*male male*x male*y male*x_x male*x_y male*y_y male*lUFBs_totalmc*/ /*female female*x female*y female*x_x female*x_y female*y_y female*lUFBs_totalmc*/ male male*x male*y male*lUFBs_totalmc female female*x female*y female*lUFBs_totalmc /subject = couple_id type=vc gcorr ; repeated women session/subject = couple_id type = un@ar(1); estimate 'male a1' male*x 1 male*y 1; estimate 'male a2' male*x_x 1 male*x_y 1 male*y_y 1; estimate 'male a3' male*x 1 male*y -1; estimate 'male a4' male*x_x 1 male*x_y -1 male*y_y 1; estimate 'female a1' female*x 1 female*y 1; estimate 'female a2' female*x_x 1 female*x_y 1 female*y_y 1; estimate 'female a3' female*x 1 female*y -1; estimate 'female a4' female*x_x 1 female*x_y -1 female*y_y 1; estimate 'male vs. female a1' male*x 1 male*y 1 female*x -1 female*y -1; estimate 'male vs. female a2' male*x_x 1 male*x_y 1 male*y_y 1 female*x_x 1 female*x_y 1 female*y_y -1; ; estimate 'male vs. female a3' male*x 1 male*y -1 female*x 1 female*y 1; estimate 'male vs. female a4' male*x_x 1 male*x_y -1 male*y_y 1 female*x_x -1 female*x_y 1 female*y_y -1; ; run;   and I recieved - WARNING: Stopped because of too many likelihood evaluations.   than I added to the first line: proc glimmix covtest data=rsa1 maxiter=1000 maxfunc=5000; where ans_ctas=1; class couple_id women session; model UFBs_total= male male*x male*y male*x_x male*x_y male*y_y male*lUFBs_totalmc female female*x female*y female*x_x female*x_y female*y_y female*lUFBs_totalmc /s ddfm=satterth noint; random /*male male*x male*y male*x_x male*x_y male*y_y male*lUFBs_totalmc*/ /*female female*x female*y female*x_x female*x_y female*y_y female*lUFBs_totalmc*/ male male*x male*y male*lUFBs_totalmc female female*x female*y female*lUFBs_totalmc /subject = couple_id type=vc gcorr ; repeated women session/subject = couple_id type = un@ar(1); estimate 'male a1' male*x 1 male*y 1; estimate 'male a2' male*x_x 1 male*x_y 1 male*y_y 1; estimate 'male a3' male*x 1 male*y -1; estimate 'male a4' male*x_x 1 male*x_y -1 male*y_y 1; estimate 'female a1' female*x 1 female*y 1; estimate 'female a2' female*x_x 1 female*x_y 1 female*y_y 1; estimate 'female a3' female*x 1 female*y -1; estimate 'female a4' female*x_x 1 female*x_y -1 female*y_y 1; estimate 'male vs. female a1' male*x 1 male*y 1 female*x -1 female*y -1; estimate 'male vs. female a2' male*x_x 1 male*x_y 1 male*y_y 1 female*x_x 1 female*x_y 1 female*y_y -1; ; estimate 'male vs. female a3' male*x 1 male*y -1 female*x 1 female*y 1; estimate 'male vs. female a4' male*x_x 1 male*x_y -1 male*y_y 1 female*x_x -1 female*x_y 1 female*y_y -1; ; run;   similar to this question - https://communities.sas.com/t5/SAS-Procedures/mixed-model-warning-message/td-p/99242   and now the error I get (whether I choose mixed or glimmix) is - WARNING: Did not converge.   What am I doing wrong? Thanks!   ... View more