What is the correct way of passing parameters to stats.friedmanchisquare based on a DataFrame?

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Chapters
00:00 What Is The Correct Way Of Passing Parameters To Stats.Friedmanchisquare Based On A Dataframe?
02:18 Answer 1 Score 2
02:43 Accepted Answer Score 1
02:54 Thank you

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Full question
https://stackoverflow.com/questions/3119...

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Tags
#python #numpy #pandas #scipy

#avk47

ANSWER 1

Score 2

The problem I see with your first attempt is that you end up passing one list with multiple dataframes inside of it.

The stats.friedmanchisquare needs multiple array_like arguments, not one list

Try using the * (star/unpack) operator to unpack the list

Like this

df = df.as_matrix()
print stats.friedmanchisquare(*[df[x, :] for x in np.arange(df.shape[0])])

ACCEPTED ANSWER

Score 1

You could pass it using the "star operator", similarly to this:

a = np.array([[1, 2, 3], [2, 3, 4] ,[4, 5, 6]])
friedmanchisquare(*(a[i, :] for i in range(a.shape[0])))