> m4=arima(dpgs,order=c(6,0,0),include.mean=F,xreg=dpus)
> m4

Call:
arima(x = dpgs, order = c(6, 0, 0), xreg = dpus, include.mean = F)

Coefficients:
         ar1     ar2     ar3     ar4      ar5      ar6    dpus
      0.3953  0.1634  0.0946  0.0297  -0.0873  -0.0525  0.1927
s.e.  0.0389  0.0400  0.0404  0.0405   0.0400   0.0373  0.0136

sigma^2 estimated as 0.0002524:  log likelihood = 1949.61,  aic = -3883.21
> tratio=m4$coef/sqrt(diag(m4$var.coef))
> tratio
       ar1        ar2        ar3        ar4        ar5        ar6
10.1665214  4.0831152  2.3403724  0.7348286 -2.1806680 -1.4083434
      dpus
14.2107813

是用t比么，求回答，上面哪些系数不显著？