
Dear R-SIG-Ecolog users, 
 
I have a general question regarding simultaneous autoregressive models (SAR models). 
 
As a measure of global fit of the SAR models (and to compare different SAR models based on the same dataset) some authors use the Nagelkerke pseudo-R-squared and some other use the squared Pearson correlation between observed and predicted values.
I’m really confused as I could not find which one of these two measures is the most appropriate to provide a general measure of the fit of a model.
 
Any advice and comments would be greatly appreciated,

Maryline PIOZ, Ph.D.

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