[R] summary of arima model in R

[Fred]

Hi,

I want to give a summary or anova for "arima" model in R, as
"summary", and "anova" for "lm".

As including various intervention factors in arima(xreg = ) part, I
want to assess the significancy of thse factors.

I can do it using interrupted analysis of time series by linear
regression, but want to see whether arima model works for the data
first.

"summary", "anova" do not work for "arima", any alternatives ???

Thank you very much.

Fred