I think that the problem is probably that y and lag(y,k=1) just get coerced
back to numeric (i.e. their time-series attributes ar lost). So your model
formula is equivalent to y~ + y, which is probably not what you wanted.
If y is in time order, I would do something like
bellver$y.1 <- c
To whom it may concern,
This is Oscar Saenz. I am working on my thesis and wanted to ask for your help.
I am using "R" to estimate a Generalized Additive Model where the concentration
of a specific pollutant is explained by a series of variables. I need to
introduce a lag of the regressand in m
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