#NYSE指數包括在NYSE上市的大多數股票，約有1500多種。年份在紐約每盎司黃金的美元價格消費者價格指數1982-1984=100紐約股票交易所指數1965.121.31=1001977147.9860.653.691978193.4465.253.701979307.6272.658.321980612.5182.468.101981459.6190.974.021982376.0196.568.931983423.8399.692.631984360.29103.992.461985317.30107.6108.901986367.87109.6136.001987446.50113.6161.701988436.93118.3149.911989381.28124.0180.021990384.08130.7183.461991362.04136.2206.33在同一散布圖中描繪黃金價格，CPI和NYSE指數。一種投資，如果它的價格和（或）回報率至少趕得上通貨膨脹，就被認為是（對通貨膨脹）保值（能抵御通貨膨脹）的。為檢驗這一假設：投資是保值的，假定a中的散點圖表明擬合以下模型是最適宜的：黃金價格+BCPI+8t12iiNYSE指數=p+pCPI+8t12ii7下表給出了，1959－1997年間美國國內總產值數據年份NGDPRGDP年份NGDPRGDP1959507.20002210.20019792557.5004630.6001960526.60002262.90019802784.2004615.0001961544.80002314.30019813115.9004720.7001962585.20002454.80019823242.1004620.3001963617.40002559.40019833514.5004803.7001964663.00002708.40019843902.4005140.1001965719.10002881.10019854180.7005323.5001966787.70003069.20019864422.2005487.7001967822.60003147.20019874692.3005649.5001968910.60003293.90019885049.6005865.2001969982.20003393.60019895438.7006062.0019701035.6003397.60019905743.8006136.30019711125.4003510.00019915916.706079.40019721237.3003702.30019926244.4006244.40019731382.6003916.30019936558.1006389.60019741496.9003891.20019946947.0006610.70019751630.6003873.90019957269.6006761.70019761819.0004082.90019967661.6006994.80019772026.9004273.60019978110.9007269.80019782291.4004503.000將當年美元和不變（即1992年）美元數據對時間描圖。用Y表示GDP,X表示時間（按年歷從1代表1959,2代表1960開始，直至39代表1997）。看以下模型是否適合GDP數據：Y=卩+卩X+￡t12tt試用當年美元和不變美元兩種數據分別估計此模型。C.