作者pitt99 (pp)
看板Statistics
标题[问题] SAS LOG Hessian 非正定 导致不能收敛的问题
时间Fri May 1 13:37:57 2009
跑SAS PROC GENMOD 时 , SAS LOG出现的
warning:the negative of the Hessian is not positive definite.
The convergebce is questionable.
warning:the procedure is continuing but the validity of the
model fit is questionable.
warning:the specified model did not converge.
warning:negative of Hessian not positive definite.
要怎麽解释上面所出现的warning?
且为什麽非正定矩阵无法收歛?
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※ pitt99:转录至看板 Math 05/01 13:38