> b.arma=arima(b,order=c(5,0,5),method="CSS",include.mean=F)
Warning message:
In arima(b, order = c(5, 0, 5), method = "CSS", include.mean = F) :
  可能遇到了收斂问题：optim信息code=1

有没有人知道这是怎么回事？