Challenge #24: ARIMA Time Series

[DavidLane]

Had not used the ARIMA time series predictive tool before so this was a nice intro.

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[jarrod]

Forecasts are spot on, but the min/max's are off a bit.. 

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Need to average annual and monthly for back filling null months.

[Lucatelli]

Please find attached my proposed solution.

[iakovidc]

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[maazinh]

Kept wondering why my values were off by a bit until I read the comments!

[mattreynolds]

Dusted off the ol' econometrics book. Was able to get very close, but not spot on to the expect output. Checked against the solution - possibly a difference between versions?

[neilgc]

Hi All,

This is my first weekly challenge submission!

I did each step quite broken out but would probably go back and reduce the steps if this was a production model. Also, I found that I had to order the data to get the right predictions, and set the number of units as an integer (which makes sense because you can't have non-whole units).

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[treepruner]

Looks like if you have decimals in the averages your forecast will be a little different. Makes real world sense, but I'm too lazy to change it now...

[treepruner]

I don't quite match the results, but I think it is because I have fractional units in my averages

[FlorianC]

As others have mentioned, I had to update the expected results with the values from the solution file in order to get the output data to match.

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