ValueError: level name Customer Number is not the name of the index

For some reason my transaction_data worked with the first data extraction example, but when I tried the hold out method it failed with the error: ValueError: level name Customer Number is not the name of the index

My ID is ‘customer number’ and this is a text field. For reference, here is the line of code that worked fine summary = summary_data_from_transaction_data(transaction_data, ‘Customer Number’, ‘DAXDate’, observation_period_end=‘2018-01-01’)

Error output:

 line 76, in ProcessSalesData
    summary_cal_holdout = calibration_and_holdout_data(transaction_data, 'Customer Number', 'DAXDate',calibration_period_end='2017-10-01',observation_period_end='2017-07-01' )
  
line 91, in calibration_and_holdout_data
    .groupby(level=customer_id_col).agg(['count'])
  File "C:\Program Files (x86)\Microsoft Visual Studio\Shared\Anaconda3_64\lib\site-packages\pandas\core\generic.py", line 6659, in groupby
    observed=observed, **kwargs)
  File "C:\Program Files (x86)\Microsoft Visual Studio\Shared\Anaconda3_64\lib\site-packages\pandas\core\groupby\groupby.py", line 2152, in groupby
    return klass(obj, by, **kwds)
  File "C:\Program Files (x86)\Microsoft Visual Studio\Shared\Anaconda3_64\lib\site-packages\pandas\core\groupby\groupby.py", line 599, in __init__
    mutated=self.mutated)
  File "C:\Program Files (x86)\Microsoft Visual Studio\Shared\Anaconda3_64\lib\site-packages\pandas\core\groupby\groupby.py", line 3177, in _get_grouper
    'index' % level)
ValueError: level name Customer Number is not the name of the index

[ariisio]

Problem solved. At least in my case, issue was related to the date value in the observation_period_end parameter. I had a script which imported data between two different dates and I used this “end” date to also define the observation_period_end. However, if the latest timestamp in the data set was less (earlier) than the observation_period_end, I received the error. So in my case, I just didn’t have any data from the time observation period should end. Thank you for your support.

[CamDavidsonPilon]

I looked at the source code, and couldn’t understand a way for this to occur. @ariisio if you find a solution or any more evidence, please report back and I’ll merge a fix!