Dear list members,<br>I need to change some of the default behavior of the X-12 ARIMA method, but could not find instructions in Gretl manual on how to do it from within Gretl.<br><br>I have a monthly survey series (sort of diffusion index) that ranges from 0 to100 and I need to get the seasonal factors. I would think in this sort of time <br>
series, additive seasonal factors make more sense than multiplicative seasonal factors. But, when running X-12 ARIMA from within Gretl I could only get the <br>multiplicative seasonal adjustment.<br>Any idea on how should I proceed to get additive seasonal decomposition ?<br>
<br>Many thanks.<br>Paulo<br><br clear="all"><br>-- <br>Paulo Gustavo Grahl, CFA<br>------------------------------------------<br><a href="mailto:pgrahl@gmail.com">pgrahl@gmail.com</a><br><a href="mailto:pgrahl@fgvmail.br">pgrahl@fgvmail.br</a><br>
+55(21) 8809-9254<br>skype:paulo.grahl<br><a href="http://www.linkedin.com/in/pgrahl">www.linkedin.com/in/pgrahl</a><br>------------------------------------------<br><br>