Arguments
X
A matrix with $n$ rows (individuals) and $p$ columns (numeric variables)
ddlobjectif
A numeric vector of length 1 which indicates the desired effective degree of
freedom (trace) of the smoothing matrix for
thin plate splines of order m.
m
The order of derivatives for the penalty (for thin plate
splines it is the order). This integer m must verify
2m+2s/d>1, where d is the number of explanatory
variables.
s
The power of weighting function. For thin plate splines
s is equal to 0. This real must be strictly smaller than d/2
(where d is the number of explanatory variables) and must
verify 2m+2s/d. To get pseudo-cubic splines,
choose m=2 and s=(d-1)/2 (See Duchon, 1977).
itermax
A scalar which controls the number of iterations for
that search
smoother
Character string which allows to choose between thin plate
splines "tps" or Duchon
splines "tps" (see Duchon, 1977).