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Re: st: Model Selection and Choices

From   Syed Basher <>
To   "" <>
Subject   Re: st: Model Selection and Choices
Date   Tue, 26 Apr 2011 23:18:39 -0700 (PDT)

Here is a straight answer. I would first check for the unit root in the data. Depending on the results, select between stationary and nonstationary modeling. The case of non-lineariy should be dictated by economic theory. If, for example, unit root is present and the theory behind your economic model is non-linearity, you can then use nonlinear cointegration. The same logic applies for stationary variables. Hope this answers your question.

Syed Abul Basher
Qatar Central Bank
P.O. Box 1234
Doha, Qatar.

From: Muhammad Anees <>
>Sent: Wednesday, April 27, 2011 8:47 AM
>Subject: Re: st: Model Selection and Choices
>Hi All!
>I have a straight question on time series modelling. I have a 37 years
>annualized time series data on five variables. I want to check if
>linear or non linear modelling would be best in my case. Is there any
>way using stata to obtain results and to select model that best
>reflects my specific time series data.
>Muhammad Anees
>MSc in Economics
>The University of Sheffield
>United Kingdom
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