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2010 Oct 25
1
structural equation modeling in sem, error, The model has negative degrees of freedom = -3, and The model is almost surely misspecified...
Hi all,
I am attempting to learn my way through the sem package by constructing
a simple structural model for some of my data on bird diversity,
abundance, and primary productivity.
I have constructed a covariance matrix between these variables as per
the following:
>S_matrix = matrix(c(
>+ 0.003083259, 0, 0,
>+ 0.143870284, 89.7648490, 0,
>+ 0.276950919, 81.3484101, 215.3570157
> ), ncol = 3, byrow = T)
>rownames(S_matrix) = colnames(S_matrix) = c("dec_mean_EVI", "density",
"ALL_Jack1")
I then constru...