Re: [R] Automatic Knot selection in Piecewise linear splines

dear all, I apologize for my delay in replying you. Here my contribution, maybe just for completeness: Similar to "earth", "segmented" also fits piecewise linear relationships with the number of breakpoints being selected by the AIC or BIC (recommended). #code (example and code from Martin

Re: [R] losing variable attributes when subsetting model.frame

dear Duncan, Thank you very much for your quick reply. Very useful and also very elegant, I would add. Thanks again, kind regards, Vito Il 08/05/2024 14:06, Duncan Murdoch ha scritto: I would guess that subsetting uses [] indexing on each column, with a logical argument.  If that is true, t

[R] losing variable attributes when subsetting model.frame

dear all, I have a simple function f() which, when included in model.frame() via the formula, returns the variable itself with some attributes. However when I specify the subset argument, the attributes get lost, apparently. I would like to extract the attributes also when specifying the subse