search for: indicatior

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2005 Dec 04
0
Error in structural equation model - "The model has negativedegrees of freedom"
...an correct this problem? I tried using a correlation matrix instead of raw moments, but still got the same error. I also fixed parameters v1,v2,v3,a1 at 1; then it gave me the error that the system is exatly singular. To answer the points that you raised: 1. x1-x6 are not causes; they are just indicatiors. Does that change my model? 2. Is the size of the dataset going to be a real limitation? How can I take care of that? Would appreciate your reply, Thanks Sunil ----------------------------------- Dear Sunil, There are 7*8/2 = 28 raw moments among the 7 observed variables. Of these, 6*7/...
2005 Dec 04
0
FW: Error in structural equation model - "The model hasnegativedegrees of freedom"
...The model is underidentified regardless of the input matrix. My point was that if you're using raw moments (as opposed to covariances or correlations) you should have a constant term in each equation. > To answer the points that you raised: > > 1. x1-x6 are not causes; they are just indicatiors. Does that change > my model? > Yes. The arrows should go the other way. > 2. Is the size of the dataset going to be a real limitation? > How can I take care of that? > . . . > ----------------------------------- > Dear Sunil, > > There are 7*8/2 = 28 raw moment...