hi,

I’m working through C4_W1 Assignment. I’m on the section:

“Define the `diff_moving_avg`

variable.

**Notice that the `window_size`

has already being defined and that you will need to perform the correct slicing for the series to match the validation period.**”

Specifically, I’m working on this line:

# Perform the correct slicing

diff_moving_avg = diff_moving_avg[None:]

From the hint, it implies that the `window_size`

has already been defined in the assignment template, however, it has not been defined.

Any suggestions, would be helpful.

Thank you,

Ed

1 Like

Hey Ed!

Excellent question!

Let’s just clear a few things up here!

`window_size`

is defined because we’re given this: `diff_moving_avg = moving_average_forecast(None, 50)`

code snippet.

If we reference the function signature, provided a few code cells above, we find this: `moving_average_forecast(SERIES, window_size=30)`

.

So from that we can infer that `window_size`

is defined to be `50`

.

Now, keep in mind, that we’re working with a subset of the data, and some seasonality, so we’ll want to factor those things into our slicing - as well as the window size.

Hopefully this helps!

Please reach out if you have any further questions!

1 Like