I am trying to fit a subset model with only lag 4. In the manual it's written "you must use `p=c(0,0,0,4)`

since `p=4`

will fit a full `AR(4)`

".

I did this.

```
#fit a subset model with just lag 4
Fit=FitAR(p=c(0,0,0,4), lag.max = "default", ARModel = "ARz")
```

However, I get the following error message:

```
Error: p > 0 are not all TRUE
```

Answer:

Use

```
GetFitARpMLE(z,4)
```

You will get

```
> GetFitARpMLE(z,4)
$loglikelihood
[1] -2350.516
$phiHat
ar1 ar2 ar3 ar4
0.0000000 0.0000000 0.0000000 -0.9262513
$constantTerm
[1] 0.05388392
```

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