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please give me answer in 10 min I will rate for sure (1) (a) plot and draw the time series for each stochastic equation below.

please give me answer in 10 min I will rate for sure

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(1) (a) plot and draw the time series for each stochastic equation below. (i) Yt = at -0.5at-1 (ii) Yt - 1.2 Yt-1 +0.2 Yt-2= at (iii) Yt= 20-0.7t + at (b) Explain the reasons to take the log differences rather than the differenced original series modelling the stochastic term in the series

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