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For ARIMA(2,1,4) you would need to use the ARIMA model, as described here. You would call with something like this ARIMA(endog, order = (2, 1, 4)) where endog is your endogenous variable and the tuple given for order follows the convention AR, Differencing, MA. For ARMA(1, 1) you could just use ARMA(endog, order = (1, 1)).
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