Function local_linear 

pub fn local_linear(
    x: &[f64],
    y: &[f64],
    x_new: &[f64],
    bandwidth: f64,
    kernel: &str,
) -> Result<Vec<f64>, FdarError>

Local linear regression smoother.

Arguments

• x - Predictor values
• y - Response values
• x_new - Points at which to evaluate the smoother
• bandwidth - Kernel bandwidth
• kernel - Kernel type

Returns

Smoothed values at x_new

Errors

Returns FdarError::InvalidDimension if x is empty, x_new is empty, or x and y have different lengths. Returns FdarError::InvalidParameter if bandwidth is not positive.

Examples

use fdars_core::smoothing::local_linear;

let x: Vec<f64> = (0..30).map(|i| i as f64 / 29.0).collect();
let y: Vec<f64> = x.iter().map(|&xi| 2.0 * xi + 1.0).collect();
let smoothed = local_linear(&x, &y, &x, 0.2, "gaussian").unwrap();
assert_eq!(smoothed.len(), 30);
// Local linear should fit linear data well in the interior
assert!((smoothed[15] - (2.0 * x[15] + 1.0)).abs() < 0.1);