Function employed within the
tempeff formula to specify the variable with a smooth effect.
The function does not fit the model, it simply returns information exploited by
the long term trend variable
the apparent dimension (i.e. the rank) of the B-spline employed to
model the long trend. For instance it could be
The function is used within the formula of
tempeff() when the long term trend of the daily time series
is fitted via a smooth term. A standard P-spline with a cubic B-spline basis and a second-order
difference penalty is employed.
A list with relevant information.
Eilers, P., Marx, B. (1996). Flexible Smoothing with B-splines and Penalties Statistical Science 11, 89–121.
Wood, S.N. (2006) Generalized Additive Models: An Introduction with R. Chapman and Hall/CRC Press.
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