Hi,
Through UI, just follow the menu path : Model/Time series/ARIMA and 
specify the seasonal lag you need.
Otherwise, try to open gretl console and type in : /help arima/, to get 
more information on arima command
Cheers,
artur
deepak bhatia a écrit :
 I am new to gretl and have been using the windows/UI version for a 
 couple of days now. Could someone help me understand how/where can I 
 specify the seasonal difference to be 3 or any number. The UI does not 
 allow me to specify a seasonal difference (lag) parameter (I am 
 assuming that it performs a 12 month seasonal difference when I 
 specify a seasonal ARIMA model by default).
  
  
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