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Re: st: arima output differs significantly from SPSS & SAS


From   Scott Merryman <scott.merryman@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: arima output differs significantly from SPSS & SAS
Date   Wed, 5 Dec 2012 14:49:39 -0600

On Tue, Dec 4, 2012 at 3:14 PM, Arash Mahdian <amahdian@gmail.com> wrote:
> How would I get the similar result in Stata?

-arima- does not have an option for conditional least squares.

Note:

“Generally, the conditional and unconditional least
squares estimators serve as satisfactory approximations
to the maximum likelihood estimator for large sample
sizes. However, simulation evidence suggests a
preference for the maximum likelihood estimator for
small or moderate sample sizes, especially if the moving
average operator has a root close to the boundary of the
invertibility region.” (page 237)

Box, G. E. P., Jenkins, G. M., and Reinsel, G. C. (1994). Time Series
Analysis, Forecasting and Control

Scott

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