- exact interpolation : a fitted curve passes through all given points
- approximate interpolation : a fitted curve does not always pass through all given points
Exact Interpolation
There are three methods;
- nearest neighbor : the same value as that of the observation is given within the proximal distance, as shown in Figure 2.7.
- linear interpolation: a piecewise linear function is applied between two adjacent points as shown in Figure 2.8.
- Moving Average : a window with a range of -d to +d is set to average the observation within the region as shown in
Figure 2.11
- B spline : a cubic curve is determined by using four adjacent observations as shown in Figure 2.12
- Curve Fitting by Least Square Method : see section 2-5