The Study of Confucius Preference for "Yi"

According to History:Confucius,Confucius loved to study Yi when he was aging.He said I would have done more work on Yi if I had more time.As one of the five writings of Confucian school,Yi includes two parts:one was written at the earlier Xizhou Dynasty,the other was from Confucius.Although famous Confucian scholars in Han and Tang Dynasty had already agreed on this,other scholars,since Ouyang Xiu to 20~(th) century,who were suspicious of the case,denied it.There are some evidences provided to prove the case.