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Quasi Differences in Yt Are Defined as A Yt−Yt−1\quad Y _ { t } - Y _ { t - 1 }

Question 17

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Quasi differences in Yt are defined as a. Yt−Yt−1\quad Y _ { t } - Y _ { t - 1 } .
b. Yt−ϕ1Yt−1Y _ { t } - \phi _ { 1 } Y _ { t - 1 } .
c. ΔYt−ϕ1Yt−1\Delta Y _ { t } - \phi _ { 1 } Y _ { t - 1 } .
d. ϕ1(Yt−Yt−1)\quad \phi _ { 1 } \left( Y _ { t } - Y _ { t - 1 } \right) .

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