Hi Ballardw, this is my code proc mixed data=corrected_2014 noinfo noclprint noitprint METHOD=MIVQUE0; class TEST_DATE PARITY CALVING_EASE CALVING_DATE County COW_ID herd_id camonth season ; model TEST_DAY_PROT_PERCENT= TEST_DAY_MILK_KG TEST_DAY_FAT_PERCENT PARITY CALVING_EASE County camonth season log_scc TEST_DAY_LACTOSE_PERCENT/ddfm=bw s ; random INT /SUB=herd_id ; run; and also I am interested in the nested effect for cow_id nested in herd_id ,however when I use random statement random int/sub=COW_ID(herd_id) ; I will have insufficient memory problem. any help to get outputs for nested effect without memory problem or a way of creating output data.? I have big data around 6000 herds and 550000 cows regards, Farg
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