if you perform an arma on the volatility and add the squared returns as an external variable do you obtain a gard? what does arima function do do you compute the regressors in r does r compute agarches what is a r curve for volatility what is the function of arima if you perform an arma on the volatility and add the squared returns as an external variable, do you obtain a garch? how to find the gap in r what is the argument for calculating an arma in r how to find a curve in r do you get gross on volatility model if you perform an arma and add the squared returns as external variable how to calculate agarch in r how do you get curve on volatility how do you calculate the gard in r what is the function for calculating the garch what is a arima in r how to calculate a curve in r if you do an arma on the volatility and add the squared returns as an external variable, do you obtain a garch? how to compute curve for volatility in r