金融工程日报：沪指震荡微跌，黄金、疫苗概念逆势大涨-20260127

• The report does not contain any specific quantitative models or factors for analysis[1][2][3] - The report primarily focuses on market performance, sentiment, fund flows, ETF premiums/discounts, block trading discounts, and index futures basis rates, but does not detail any quantitative models or factor construction processes[4][5][6] - No formulas or specific quantitative testing results for models or factors are provided in the report[7][8][9]