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Fourth Difference = Yt+4 - Yt Fourth Difference = Yt+4 - Yt 19.47 4.11 -2.02 -7.96 -14.55 4.29 -1.53 -12.69 -13.3 -12.96 -7.32 13.42 21.69 12.91 Income 0.17 15.13 26.59 16.07 19.64 19.24 24.57 8.11 5.09 23.53 23.04 -4.58 -8.21 10.57 15.72 8.84 13.48 23.48 26.89 27.17 24.93 42.15 48.83 38.37 41.85 58.52 58.62 20.34 11.83 59.72 67.72 43.36 33 85.32 60.86 28.16 50.87 93.83 92.51 80.55 70.01 133.39 11.17 18.33 11.45 18.67 21.94 11.2 16.92 16.37 9.79 -18.03 -30.02 1.2 9.1 23.02 21.17 25.6 -6.86 -15.2 17.87 8.51 31.65 52.39 19.14 39.56) 129.64 100.38 95.85 157.76 126.98 93.8 37.13 19.83 25.84 24.37 -2.66 -6.58 Time Series Plot of Fourth Difference 60 50 40 30 20 Fourth Difference 10 0 sung -10 -20 -30 Quarter al al at To al Q1 a QI Year 8861 2661 1989 1990 1991 1992 1994 1995 1996 1999 The time series plot for fourth difference is non stationary because of the series at the fixed level