If  =1, equation (5a) becomes a ra

If  =1, equation (5a) becomes a random walk, that is, a non stationary process. As a result of this

there tends to be the so called unit root problem which means there is a situation of non stationarity in the series. However, if 

Hasil (Bahasa Indonesia) 1:

If  =1, equation (5a) becomes a random walk, that is, a non stationary process. As a result of thisthere tends to be the so called unit root problem which means there is a situation of non stationarity in the series. However, if  <1, this means that the series Yt is stationary. However, the unit rootcase, equation (5a) can be further manipulated by subtracting Yt 1 from both sides and obtain:

Hasil (Bahasa Indonesia) 2:

Jika  = 1, persamaan (5a) menjadi acak berjalan, yaitu, proses non stasioner. Sebagai hasil dari ini ada cenderung disebut Unit akar masalah yang berarti ada situasi non stasioneritas dalam seri. Namun, jika  <1, ini berarti bahwa seri Yt adalah stasioner. Namun, unit root kasus, persamaan (5a) dapat lebih dimanipulasi dengan mengurangi Yt 1 dari kedua belah pihak dan memperoleh: