Get the Time s e ri e s ' nottem '
>>> t s = g e t _ t s ( ' nottem ' )
```
We split the time series into training and test parts. The test contained the last 12 values of the time series and the training part contained the remaining data. A Psf model was then created using the training set as shown in Listing 3.

**Listing 3.** Command to create a Psf model.

```
>>> t r ai n , t e s t = t s [ : len ( ts )−12], ts [ len ( ts ) −12:]