f_oneway should accept a nested list

When you want to make a generic function which gathers all the lists with values and you want to compare their means with f_oneway, you have to gather them in a list. Apparantly the functions f_oneway does not accept a nested list, but only separate lists.

Example:

import pandas as pd
from scipy.stats import f_oneway

df = pd.DataFrame({'Weight': [4.17,5.58,5.18,6.11,4.5,4.61,5.17,4.53,5.33,5.14,4.81,4.17,4.41,3.59,5.87,3.83,6.03,4.89,4.32,4.69,6.31,5.12,5.54,5.5,5.37,5.29,4.92,6.15,5.8,5.26],
                   'Group': ['A','A','A','A','A','A','A','A','A','A','B','B','B','B','B','B','B','B','B','B','C','C','C','C','C','C','C','C','C','C'] 
                   })

This works, when we hardcode each separate list:

grps = [d['Weight'].tolist() for _, d in df.groupby('Group')]

l1 = grps[0]
l2 = grps[1]
l3 = grps[2]

F, p = f_oneway(l1,l2,l3)
print(F, p)

4.846087862380136 0.0159099583256229

This does not work, when we pass the nested list grps to f_oneway:

F, p = f_oneway(grps)
print(F, p)

[nan nan nan nan nan nan nan nan nan nan] [nan nan nan nan nan nan nan nan nan nan]

So am I missing something here, or is there any other solution to this?

[EverLookNeverSee]

Hi @erfannariman , Don’t worry. just try to learn and level up your technical skills. There is no need to be a professional and experienced programmer, start from small and simple. Good luck!

[erfannariman]

have some ideas for contribution … Im not confident if my code is written well enough and Im not sure how to write good tests

We can help with that. If you have ideas for new features, it is best to discuss them on the mailing list or in a github issue like this one. But once there is agreement that a new feature would be a good fit for scipy, pull requests are welcome. (As are pull requests to fix bugs.)

If you do end up submitting a pull request, don’t be surprised if you are asked to make a lot of changes. It can take a while to learn all our requirements for documentation, coding style (including PEP 8), unit tests, commit messages, and so on.

Yes I will submit a pull request in time. It’s not only about the code, also for the documentation or for the docstrings. About the “lot of changes”, that’s perfectly fine, even better to get feedback and learn! I will use the contributor guide as my guideline for now.