Proc Mixed nagative variance

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Proc Mixed nagative variance

Dear community,

I am using METHOD=TYPE3 in PROC MIXED to retain negative variance-component estimates following Littel, Stroup, Dixon. However, I obtained a negative F value. I am new here, could you please help me? I know the nobound option is an alternative, but I would like to work with type3 method.

Proc Mixed nagative variance

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