[R] sem-Package BIC calculation wrong!?
Ludwig Kreuzpointner
Ludwig.Kreuzpointner at psychologie.uni-regensburg.de
Thu Mar 30 16:09:17 CEST 2017
To whom it may concern,
when I was calculating BIC with sem
e.g. as follows:
cfa.mod <- cfa(reference.indicators=FALSE, covs=NULL)
F1: Sentences, Vocabulary, Sent.Completion, First.Letters, Four.Letter.Words
cfa.sem <- sem(cfa.mod, S=Thurstone, N=355)
summary(cfa.sem)
the BIC value is wrong!
For the example it results
BIC = 104.5072
Correct with a formula I found in text books:
BIC= χ2 + ln(N)[k(k + 1)/2 - df]
BIC should be 192.588977895
104.5072 I got, when set k=0
I think there must be a mistake when getting the numbers of parameters.
Kind regard
Ludwig Kreuzpointner
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