CAM-UV main search: identify each variable's parents — camuv_find

Faithful port of CAMUV._find_parents(). Scans variable subsets of increasing size t (starting at 2); whenever any parent is identified, t resets to 2, otherwise t grows until it exceeds num_explanatory_vals. The residual matrix Y is updated in place each time a variable gains a parent. A final pruning pass removes parents whose residuals turn out to be independent of the child's residual.

Usage

camuv_find_parents(
  X,
  maxnum_vals,
  N,
  pk_forbidden,
  independence,
  alpha,
  ind_corr,
  reg_fn
)

Arguments

X: data matrix
maxnum_vals: maximum subset size (num_explanatory_vals)
N: neighborhood list from camuv_get_neighborhoods()
pk_forbidden: forbidden-cause list, or NULL
independence: "hsic" or "fcorr"
alpha: significance level (hsic only)
ind_corr: rejection threshold (fcorr only)
reg_fn: regressor function

Value

list of parent index vectors per variable