Re: Effect of FOCE vs FOCE INTER on success of covariance step within a model with additive error

From: Xu Xu xu.xu@bms.com Subject: Re: [NMusers] Effect of FOCE vs FOCE INTER on success of covariance step within a model with additive error Date: Fri, 10 Mar 2006 09:43:08 -0500 Hi, When I get this error massage, I usually set MATRIX=S in $COV and then the covariance step would run successfully. But this doesn't work for "R MATRIX SINGULAR". Could someone explain what is the reason for this? What is the difference between R and S matrices? Thanks a lot! Xu