Extracts information, such as fitted values, influence functions
from a "locfit" object.
lfknots(x, tr, what = c("x", "coef", "h", "nlx"), delete.pv = TRUE)A matrix with one row for each fit point. Columns correspond to
the specified what vector; some fields contribute multiple columns.
Fitted object from locfit().
Back transformation. Default is the invers link function from the Locfit object.
What to return; default is c("x","coef","h","nlx").
Allowed fields are x (fit points); coef (fitted values);
f1 (local slope); nlx (length of the weight diagram);
nlx1 (estimated derivative of nlx); se (standard errors);
infl (influence function); infla (slope of influence function);
lik (maximixed local log-likelihood and local degrees of freedom);
h (bandwidth) and deg (degree of fit).
If T, pseudo-vertices are deleted.