中文说明：这个例子展示了如何应用偏最小二乘回归(plsr)主成分回归(PCR)，并讨论了两种方法的有效性。本人亲测有效
English Description：
This example shows how to apply partial least squares regression (PLSR) principal component regression (PCR) and discusses the effectiveness of the two methods. My personal test is effective