Hi, When I was trying to fit Proc Glimmix model, I found the following message repeatedly. "WARNING: Obtaining minimum variance quadratic unbiased estimates as starting values for the covariance parameters failed." My SAS code is the following. ods html; ods graphics on proc glimmix data=malaria INITGLM NOBOUND asycov asycorr oddsratio ORDER=DATA MAXOPT=100 METHOD=RSPL; class sex s1_03 s1_12 s1_07 s2_01 s2_02 s2_03 s2_04 s2_05 s2_06 rm1_08 rm1_09 rm1_10 rm1_14 n01_115t; model rdt_res = age sex famsize s1_03 s1_13 s2_01 s2_02 s2_03 s2_04 s2_05 s2_06 tot_room rm1_08 rm1_09 rm1_10 rm1_11 rm1_12 rm1_14 rm1_nets n01_115t s2_01*rm1_09 s2_02*rm1_10 age*sex sex*s2_01 sex*s2_04 sex*rm1_10 /dist = binary solution covb corrb DDFM=BETWITHIN; random intercept/ subject = s1_07; Covtest GLM ; Covtest DIAGG ; Covtest DIAGR ; Covtest HOMOGENEITY ; Covtest START ;Covtest ZEROG ; weight Weight; run; ods graphics off; ods html close; I need help. Please could any one give me a solution? Regards,
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