Why do I get this warning that the length of my time series is -1 ?
I am trying to do a Forecast Validation on an ARIMA model.
This is my main process.
I definitely got data in my Excel.
Why this warning ?
If I run it then this error appears.
This is my main process.
I definitely got data in my Excel.
Why this warning ?
If I run it then this error appears.
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these are two different things. The first warning comes, because RapidMiner does not know the length of your excel file. Then it warns you that it may be too short. Did you run the wizard?
The second one is an error of the ARIMA operator you likely run inside. It just fails to find a solution.
Best,
Martin