Hi, I'm estimating a demand/supply model using the system option of GRETL. I would like to know if is possibel to insert an MA (Moving Average) term in one of my equation. If yes, how I should proceed? Thanks in advance, -- *Ricardo Gonçalves Silva* *Consultor* *STEPWISE* *Inteligência Estatística e Apoio à Decisão* Rua XV de Novembro, 2.190 - Conj. 06 São Carlos, SP - 13.560-240 Office: +55 (16) 3419.9800 <%2B55%20%2816%29%203419.9800> www.stepwise.com.br