basis_list_cols: List Basis Functions

View source: R/make_basis.R

basis_list_colsR Documentation

List Basis Functions

Description

Build a list of basis functions from a set of columns

Usage

basis_list_cols(
  cols,
  x,
  smoothness_orders,
  include_zero_order,
  include_lower_order = FALSE
)

Arguments

cols

Index or indices (as numeric) of covariates (columns) of interest in the data matrix x for which basis functions ought to be generated. Note that basis functions for interactions of these columns are computed automatically.

x

A matrix containing observations in the rows and covariates in the columns. Basis functions are computed for these covariates.

smoothness_orders

An integer vector of length ncol(x) specifying the desired smoothness of the function in each covariate. k = 0 is no smoothness (indicator basis), k = 1 is first order smoothness, and so on. For an additive model, the component function for each covariate will have the degree of smoothness as specified by smoothness_orders. For non-additive components (tensor products of univariate basis functions), the univariate basis functions in each tensor product have smoothness degree as specified by smoothness_orders.

include_zero_order

A logical, indicating whether the zeroth order basis functions are included for each covariate (if TRUE), in addition to the smooth basis functions given by smoothness_orders. This allows the algorithm to data-adaptively choose the appropriate degree of smoothness.

include_lower_order

A logical, like include_zero_order, except including all basis functions of lower smoothness degrees than specified via smoothness_orders.

Value

A list containing the basis functions generated from a set of input columns.


hal9001 documentation built on Nov. 14, 2023, 5:08 p.m.