Least Square Error Method Robustness of Computation: What is not usually considered and taught
Abstract
There are many practical applications based on the Least Square Error (LSE) approximation. It is based on a square error minimization 'on a vertical' axis. The LSE method is simple and easy also for analytical purposes. However, if data span is large over several magnitudes or nonlinear LSE is used, severe numerical instability can be expected. The presented contribution describes a simple method for large span of data LSE computation. It is especially convenient if large span of data are to be processed, when the 'standard' pseudoinverse matrix is ill conditioned. It is actually based on a LSE solution using orthogonal basis vectors instead of orthonormal basis vectors. The presented approach has been used for a linear regression as well as for approximation using radial basis functions.
 Publication:

arXiv eprints
 Pub Date:
 January 2018
 arXiv:
 arXiv:1802.07591
 Bibcode:
 2018arXiv180207591S
 Keywords:

 Computer Science  Graphics;
 Computer Science  Computer Vision and Pattern Recognition
 EPrint:
 doi:10.15439/9788394625375