急！！！求教：proc mixed语句中的问题？？

10# zhaojing830712

This message is pretty common in mixed procedure, particularly when using both random and repeated statement in the model (in more than 90% cases).
Non-positive definite may be caused by zero variance whereas the model may still be able to correctly estimate the variance and thus many people are quite comfortable with this message.

哦，这样啊，真是万分感谢！！