On 20.02.2010 08:51, Dan Edgcumbe wrote:
I'm trying to do some confirmatory factor analysis on some data. My SEM
model solves in 22 iterations, but when I try to look at the modification
indices, using mod.indices, I get the following error message:
Error in solve.default(hessian) :
system is computationally singular: reciprocal condition number =
4.40283e-18
What does this mean?
That the method you apply tries to invert some object called "hessian"
(maybe a hessian? ;-)) but fails since a singular matrix cannot be
inverted. Perhaps (as I often found for people doing sem analyses) you
have less observations than parameters to estimate or only certain
combinations for some factors?
Uwe Ligges
Many thanks,
Dan
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