Analyze the autocorrelation coefficients for the series shown in Figures 3-18 through 3-21. Briefly describe each series.
Figure 3-18

Figure 3-19

Figure 3-20

Figure 3-21

Transcribed Image Text:

Autocorrelation Function for Trade 1.0 0,8 20.4 0.2 0.0 0.2- 0.6 0.8 10 15 Autocorrolation Function for Acid 1.0- 0.8 0.6- 0.4- 0.01 0.2 0.6 0.8 12 17 Autocorrelation Function for Trade First Differenced 1.0 0.6 0.4- 0.2 0.0 0.2 0.4 -0.6 0.8 15 25 Autocorrelation Function for Fuel 1.0 0.8 c 0.6 0.4 0.0 +--ㄒㄧㄧ 0.4 0.6 0.8 10 15