Function fpc_vif 

pub fn fpc_vif(
    fit: &FregreLmResult,
    data: &FdMatrix,
    scalar_covariates: Option<&FdMatrix>,
) -> Result<VifResult, FdarError>

Variance inflation factors for FPC scores (and optional scalar covariates).

For orthogonal FPC scores without scalar covariates, VIF should be approximately 1.

Errors

See crate::explain_generic::generic_vif for error conditions.