Dear all,
When I run an arima(1,1,1) on an I(1) variable, y, I get different estimates to
when I first difference the variable myself, e.g y2-diff(y), and then run
arima(1,0,1) on y2. Shouldn't these two approaches give the same output?
Any help will be much appreciated.
george
at 2:14 PM, George Milunovich
george.milunov...@mq.edu.au wrote:
Dear all,
When I run an arima(1,1,1) on an I(1) variable, y, I get different estimates
to when I first difference the variable myself, e.g y2-diff(y), and then
run arima(1,0,1) on y2. Shouldn't these two approaches give the same
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