最小二乘法主成分分析等多种常用统计学算法推导和代码实现，代码在附录中，过程详细，代码注释清楚，适合初学者修改应用。-Least squares method commonly used principal component analysis and other statistical algorithms to derive and code, the code in the appendix, the process in detail, code comments clear, suitable for beginners to modify applications.