I get a blank assertion error as well

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
25/100
Issue type
Bug
Clarity
Needs clarification
Activity status
Stale
Tech stack
python
Domain
data

Research direction

Start by reproducing the blank assertion error from the dmatrices call shown in the issue, using the referenced formula and data. Trace the failure from dmatrices and determine the expected diagnostic or behavior; done means the reported case no longer produces an unexplained blank assertion error.

Written by the indexing model from the issue text.

Description

I have a similar issue. When doing this I get a blank assertion error as well

`outcome_1, predictors_1 = patsy.dmatrices("Q('%received 18+') ~ n_killed_capita_2016", aggregate_2016_df)

mod_1 = sm.OLS(outcome_1, predictors_1)

res_1 = mod_1.fit()

print(res_1.summary())`

Originally posted by @bhaktatejas922 in https://github.com/pydata/patsy/issues/148#issuecomment-501188532

Dominant language
Python
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Merged PRs (30d)
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