估计出的模型如下
Call:
arima(x = r, order = c(1, 0, 1))

Coefficients:
          ar1     ma1  intercept
      -0.8063  0.9221     0.0791
s.e.   0.0658  0.0610     0.0611

sigma^2 estimated as 4.498:  log likelihood = -2957.1,  aic = 5922.2

如何用R软件对其进行参数的显著性检验以判断模型的参数是否有效？？