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I would like to know, how can i type an equation of ARIMA(2,1,1)-GARCH(1,0) and what method for this equation? Can i use ls method? How about an equation for ARIMA(2,1,1)-GARCH(1,1) and ARIMA(2,1,1)-GARCH(2,1) Thank you.

To estimate a GARCH model, you use the ARCH estimation method. You can add ARMA terms to the mean equation in the same way you would add them in a least squares estimation.