1-
Stationarity keeps the correlation constant.
2-
Stationary processes avoid the
problem of spurious
regression
3- Stationary process simplifies law of
large numbers and allows to apply central limit theorem.
4-
(X / Y) stationary, if the sample
period is long than Compounded rate of growth of X approaches compounded rate
of growth of Y.
5-
Auto Correlation to make sense, the
series must be a weakly stationary series.
Details Follow:https://drive.google.com/open?id=1EW0oDCRlYoRJOe9ygVMuB-5WJZH57HFa
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