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> library("lmtest")
> a = arima.sim(list(ar = c(.05, -.05)), 1000)
> b = arima(a, order = c(2, 0, 0))
> resettest(b)
**Error in terms.default(formula) : no terms component nor attribute**

Question 1. What I am doing is shown above. What should I do about that? (I have tried to put in type, data and power parameter at resettest(), result is the same.)

Question 2.If I want to do the same thing on the model below

enter image description here

which is a ar(2) model plus enter image description here, how to fit this nonlinear model (by using R, thank you!)?

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  • $\begingroup$ I am sorry if these questions are way too fundamental :( New on this field. $\endgroup$
    – recon
    Commented Apr 3, 2019 at 13:33
  • $\begingroup$ Seems it s an unpopular field :) guys plz! if you just passed by and know someone who is good at this field, feel free to tag them! thank you so much! $\endgroup$
    – recon
    Commented Apr 4, 2019 at 7:05

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