El 01/03/11 07:51, Sam Sam escribió: > Dear all: > > The formulation of the Schwarz Bayesian Information Criterion is -2 > ×/L(θ)+ k //log n in /gretl user`s guide. > > But the gretl output of ARIMA seems cauculated by the formulation of -2 > ×/L(θ)+ k //ln n ./ > // > /Is it log or ln ?/ > // > /Thanks a lot/ > // > // >
When we talk about "likelihood" in econometrics we usually refer to Gaussian likelihood. In such a context, using natural logs (or neperian logs) has the advantage of simplifying the likelihood function. So, by default, when we write 'log' we are talking about natural logs. If you want to be more precise, you may write it 'ln', but it is very common in the econometrics literature to write it as 'log. In short, they are the same: natural logs. -- Ignacio Diaz-Emparanza DEPARTAMENTO DE ECONOMÍA APLICADA III (ECONOMETRÍA Y ESTADÍSTICA) UPV/EHU Avda. Lehendakari Aguirre, 83 | 48015 BILBAO T.: +34 946013732 | F.: +34 946013754 www.ea3.ehu.es
