/* first differences of quarterly, seasonally adjusted U.S. fixed investment 1947.2-1972.4 Source: U.S. Department of Commerce, Bureau of Economic Analysis, The National Income and Product Accounts of the United States, 1929-1974 (see also Table E.2 of Lütkepohl (1991)) */ 1 1947.2 4 USinvestment -2.0 1.9000000000000057 5.200000000000003 2.3999999999999915 0.30000000000001137 -0.8000000000000114 -0.5 -4.299999999999997 -2.8999999999999915 -0.4000000000000057 2.0999999999999943 4.800000000000011 6.8999999999999915 5.900000000000006 -1.2999999999999972 -3.5 -3.1000000000000085 -0.8999999999999915 -0.8000000000000114 0.7000000000000028 1.0 -5.0 5.299999999999997 3.3000000000000114 0.29999999999999716 0.20000000000000284 -0.6000000000000085 -1.0 1.2999999999999972 2.9000000000000057 1.5 3.5999999999999943 4.0 2.200000000000003 0.5 -2.200000000000003 0.8000000000000114 0.19999999999998863 -1.0 -0.3999999999999915 -0.9000000000000057 1.1000000000000085 -1.5 -4.900000000000006 -2.799999999999997 0.7999999999999972 5.0 5.299999999999997 3.299999999999997 1.0 -1.1999999999999886 3.5 -3.1000000000000085 -3.0 -0.20000000000000284 -0.8999999999999915 1.5 2.0999999999999943 3.299999999999997 1.5 3.8000000000000114 1.1999999999999886 -1.0 0.6000000000000085 5.299999999999997 2.5 3.5 2.0 0.0 0.9000000000000057 1.5 7.0 4.5 2.1999999999999886 3.700000000000017 3.6999999999999886 -1.3000000000000114 -1.1999999999999886 -5.300000000000011 -3.299999999999983 3.1999999999999886 1.5 4.400000000000006 3.4000000000000057 0.0 1.799999999999983 4.300000000000011 4.099999999999994 -0.6999999999999886 -0.30000000000001137 -3.799999999999983 -2.5 -1.8000000000000114 0.4000000000000057 -0.9000000000000057 4.800000000000011 4.099999999999994 3.6999999999999886 3.9000000000000057 8.300000000000011 1.799999999999983 2.0999999999999943 8.5