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krippendorff-alpha's Issues

Add tests

Great package. Would be even better if there were unit tests to demonstrate its correctness!

Alpha falis for perfect relibility

Minimal working example

array = [[1,1,1],[1,1,1],[1,1,1]]   
print("nominal metric: %.3f" % krippendorff_alpha(array, nominal_metric, missing_items=missing))
print("interval metric: %.3f" % krippendorff_alpha(array, interval_metric, missing_items=missing))

Output

./krippendorff_alpha.py:103: RuntimeWarning: invalid value encountered in double_scalars
  return 1.-Do/De
nominal metric: nan
interval metric: nan

If I understand Krippendorff Alpha, the expected output should be one for all metrics. I'm not sure what should be done if there are missing values.

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