ocr: a5 90E 85 ao 3PCS 8PCS ME 10PCS 707 65! 60 340 750 160: 110: 780 790: 800 810 820 830 840 Day Figure 2: Porcent of total variation explained by different numbers of principal components. Examination on: a day-by-day basis shows market shifts and suggests alterative models, each one, parameterized by a fixed number of principal components,