st: xtlsdvc with quarterly data

["Tudela Carreres, Merxe" <Merxe.Tudela@moodys.com>]

I am using xtlsdvc with quarterly data. The dependent variable (electricity demand) has a strong seasonal effect.  Is it possible to include the fourth lag of the dependent variable instead of the first lag?

I would prefer not to SA the data as among my explanatory variables I have heating and cooling degree days whose effects on demand I would like to estimate.

My N = 48 and T = 80 (or 25 years) 

Thank you
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