> modelx=arima(USDCNY,order=c(3,1,1))> modelxCall:arima(x = USDCNY, order = c(3, 1, 1))Coefficients: ar1 ar2 ar3 ma1 0.2976 -0.0188 -0.0276 -0.4316s.e. 0.4767 0.0673 0.0502 0.4773sigma^2 estimated as 4.592e-05: log likelihood = 6528.68, aic = -13047.37> plot(forecast(modelx,50))